Publications
| Title | Abstract | Year(sorted ascending) Filter | PMID Filter |
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| indirect interaction between two native thistles mediated by an invasive exotic floral herbivore. | spatial and temporal variation in insect floral herbivory is common and often important. yet, the determinants of such variation remain incompletely understood. using 12 years of flowering data and 4 years of biweekly insect counts, we evaluated four hypotheses to explain variation in damage by the eurasian flower head weevil, rhinocyllus conicus, to the native north american wavyleaf thistle, cirsium undulatum. the four factors hypothesized to influence weevil impact were variations in climate, ... | 2005 | 16086168 |
| effect of temperature on the termination of prolonged larval diapause in the chestnut weevil curculio sikkimensis (coleoptera: curculionidae). | adults of the chestnut weevil curculio sikkimensis emerged over a 3-year period under laboratory and quasi-field conditions due to a prolonged diapause that occurred at the mature larval stage. variable proportions of the larvae remained in diapause after a single cold (5 degrees c) treatment of 120 days. extension of the chilling period to as long as 540 days did not increase the percentage of diapause termination, and excessively long chilling actually reduced the percentage. chilling was not ... | 2005 | 16198368 |
| the pesticide malathion reduces survival and growth in developing zebrafish. | malathion is an organophosphorous pesticide widely used to control mosquitoes in urban areas and pests, such as boll weevils, in agricultural areas. zebrafish, danio rerio, are model organisms for developmental toxicology research because they are readily available, produce large numbers of clear embryos, and are sensitive to environmental changes. the nonlethal effects of malathion on developing zebrafish embryos, however, previously have not been analyzed quantitatively. we exposed zebrafish e ... | 2005 | 16050592 |
| the effect of environmentally induced changes in the bark of young conifers on feeding behaviour and reproductive development of adult hylobius abietis (coleoptera: curculionidae). | young plants of sitka spruce, scots and corsican pine were subject to high and low light, and high and low nitrogen treatments in a polyhouse experiment. the effect of treatments on resin duct size and nitrogen concentration in stem bark was determined together with feeding by hylobius abietis linnaeus on the stems of 'intact' plants and on 'detached' stems cut from the plant. resin duct size was largest on corsican pine and smallest on sitka spruce and inherent variation in duct size between th ... | 2005 | 15877864 |
| larval competition in weevils revena rubiginosa (coleoptera: curculionidae) preying on seeds of the palm syagrus romanzoffiana (arecaceae). | inter- and intraspecific local resource competition may lead to the selection of specific adaptive individual characteristics to overcome interference competition. a highly selective scenario is predictable for interference competition among seed preying weevil larvae that live in and feed upon a single host seed. this scenario is found in syagrus romanzoffiana palm seeds which are predated by revena rubiginosa (curculionidae) larvae. although multiple infestation of one seed by weevil larvae ca ... | 2005 | 15871001 |
| electrophysiological and behavioral responses of dendroctonus frontalis (coleoptera: curculionidae) to volatiles isolated from conspecifics. | olfactory sensitivity of the southern pine beetle, dendroctonus frontalis zimmermann, to compounds isolated from the mid/hindguts of newly emerged conspecific adults was assayed with coupled gas chromatography-electroantennographic detection. all previously reported pheromones for d. frontalis plus eight additional compounds (fenchyl alcohol, myrtenal, cis-verbenol, trans-pinocarveol, acetophenone, trans-myrtanol, cis-myrtanol, and 2-phenylethanol) consistently elicited antennal responses from a ... | 2005 | 16539134 |
| rapid screening of invertebrate predators for multiple prey dna targets. | dna-based techniques are providing valuable new approaches to tracking predator-prey interactions. the gut contents of invertebrate predators can be analysed using species-specific primers to amplify prey dna to confirm trophic links. the problem is that each predator needs to be analysed with primers for the tens of potential prey available at a field site, even though the mean number of species detected in each gut may be as few as one or two. conducting all these pcrs (polymerase chain reacti ... | 2005 | 15723673 |
| innate and changed responses to plant odours in moths and weevils. | 2005 | 15738166 | |
| selection of assessment methods for evaluating banana weevil cosmopolites sordidus (coleoptera: curculionidae) damage on highland cooking banana (musa spp., genome group aaa-ea). | cosmopolites sordidus (germar) is an important pest on bananas and plantains. population build-up is slow and damage becomes increasingly important in successive crop cycles (ratoons). yield loss results from plant loss, mat disappearance and reduced bunch size. damage assessment requires destructive sampling and is most often done on corms of recently harvested plants. a wide range of damage assessment methods exist and there are no agreed protocols. it is critical to know what types of damage ... | 2005 | 15877860 |
| jh iii production, titers and degradation in relation to reproduction in male and female anthonomus grandis. | juvenile hormone (jh) is necessary for the production of vitellogenin (vg) in the boll weevil, anthonomus grandis. occurrence of vg in this species is typically restricted to reproductively competent females, and is not detected in untreated males. however, the jh analog, methoprene stimulates vg production in intact males and in the isolated abdomens of both male and female boll weevils (where in each case no vg is detected without treatment), suggesting that males are competent to produce vg b ... | 2005 | 15890186 |
| seasonal dynamics of entomopathogenic nematodes of the genera steinernema and heterorhabditis as a response to abiotic factors and abundance of insect hosts. | the seasonal dynamics of entomopathogenic nematodes (epns) of the genus steinernema and heterorhabditis were studied during one season in meadow and oak wood habitats, in the vicinity of ceské budejovice, czech republic. the influences of soil temperature, moisture, and abundance of suitable hosts on epn dynamics were investigated. the host range of these nematodes, in both habitats was also observed. a total of four epn species were found in both habitats. steinernema affine was the dominant sp ... | 2005 | 15893761 |
| antifeedants against hylobius abietis pine weevils: an active compound in extract of bark of tilia cordata linden. | linden (tilia cordata) bark was shown to contain an antifeedant effective against the large pine weevil, hylobius abietis. soxhlet extraction of inner and outer bark resulted in an extract that showed antifeedant activity in a microfeeding assay. the extract was fractionated by chromatography on silica gel using gradient elution with solvents of increasing polarity. the content of the fractions obtained was monitored by thin layer- and gas chromatography. fractions of similar chemical compositio ... | 2005 | 16124228 |
| persistence and efficacy of three diatomaceous earth formulations against sitophilus oryzae (coleoptera: curculionidae) on wheat and barley. | the insecticidal and residual efficacy of three diatomaceous earth (de) formulations, insecto, pyrisec, and silicosec, against sitophilus oryzae (l.) on barley and wheat was assessed. for this purpose, 4-kg lots of barley and wheat were treated with the above-mentioned de formulations, in three dose rates (0.75, 1, and 1.5 g/kg grain) and stored at 26 degrees c. samples of these lots were taken at the day of storage, and every 45 d, until the completion of a 450-d period of storage. bioassays we ... | 2005 | 16156597 |
| proactive spraying against boll weevils (coleoptera: curculionidae) reduces insecticide applications and increases cotton yield and economic return. | the current standard practice of two to three preemptive insecticide applications at the start of pinhead (1-2-mm-diameter) squaring followed by threshold-triggered (whenever 10% of randomly selected squares have oviposition punctures) insecticide applications for boll weevil, anthonomus grandis grandis boheman, control does not provide a reliably positive impact on cotton, gossypium hirsutum l., yields in subtropical conditions. this study showed that four fewer spray applications in a "proacti ... | 2005 | 16539122 |
| size-dependent feeding and reproduction by boll weevil (coleoptera: curculionidae). | the considerable variation in adult size of the boll weevil, anthonomus grandis grandis boheman, has been well documented, but the influences of adult size on reproductive rate are not known. we examined the relationship between the size of boll weevils and their feeding and oviposition. weevils weighed to the nearest milligram were grouped into five categories based on pupal weight: < or =5, 6-10, 11-15, 16-20, and >20 mg. numbers of lifetime punctures produced in flower buds (squares) of cotto ... | 2005 | 16022302 |
| biological control of the coffee berry borer hypothenemus hampei (coleoptera: curculionidae) by phymastichus coffea (hymenoptera: eulophidae) in colombia. | the potential of the eulophid parasitoid phymastichus coffea lasalle to control coffee berry borer hypothenemus hampei (ferrari) populations under field conditions in colombia was evaluated. parasitoid adults were released one, five and nine days after artificial infestations of 90-, 150- and 210-day-old coffee berries with h. hampei females. the position of the beetle inside the berry and the parasitism levels were assessed ten days after each p. coffea release. parasitism of h. hampei by p. co ... | 2005 | 16197567 |
| recycling potential and fitness of steinernematid nematodes cultured in curculio caryae and galleria mellonella. | the recycling potential of entomopathogenic nematodes in the pecan weevil, curculio caryae, following inundative applications is an important factor in considering whether nematodes could be incorporated into a c. caryae management strategy. our objective was to determine the recycling potential and fitness of steinernema carpocapsae and s. riobrave cultured in c. caryae. to estimate fitness and quality, we reared nematodes in larvae of c. caryae and in the commonly used standard host, the great ... | 2005 | 19262838 |
| evidence of b-chromosomes in the karyotype of barypeithes pellucidus boheman 1834 (coleoptera, curculionidae, entiminae) from central europe. | b-chromosomes were observed in spermatogonial mitotic metaphases, meiotic metaphases i and ii of barpeithes pellucidus from one population in slovakia. the number of b-chromosomes ranged from one to six per cell and they paired with the sex heterochromosomes in the first meiotic metaphase and rarely with the autosomes. in metaphase i one b-chromosome was always associated with x chromosome forming a tripartite complex. the xybp was easily recognizable as a complex of three chromosomes in a parac ... | 2005 | 16212110 |
| ipsenol and ipsdienol attract monochamus titillator (coleoptera: cerambycidae) and associated large pine woodborers in southeastern united states. | we determined the responses of the southern pine sawyer, monochamus titillator (f.) (coleoptera: cerambycidae), to the pheromones (ipsenol, ipsdienol, and lanierone) used by pine engraver beetles (coleoptera: scolytidae) in the southeastern united states. (+/-)-ipsenol, (+/-)-ipsdienol, or a combination increased catches of m. titillator in florida, louisiana, georgia, and north carolina. catches of acanthocinus obsoletus (olivier) (cerambycidae) were increased by (+/-)-ipsenol and (+/-)-ipsdien ... | 2005 | 16539130 |
| hybrid poplar clones with populus maximowiczii parentage demonstrate postoviposition antibiosis to cryptorhynchus lapathi (coleoptera: curculionidae). | damage caused by the poplar-and-willow borer, cryptorhynchus lapathi (l.) (coleoptera: curculionidae), is reported to vary among hybrid poplar clones. we evaluated oviposition preferences and larval success in four hybrid poplars on potted and field-planted trees. oviposition occurred somewhat less frequently and abundantly on two clones with populus maximowiczii henry parentage in field-planted and potted trees, and significantly fewer larvae survived to adulthood on those clones. no adults eme ... | 2005 | 16539157 |
| potential use of essential oils from cameroon applied as fumigant or contact insecticides against sitophilus zeamais motsch. (coleoptera: curculionidae). | essential oils from seven plants species currently found in cameroon were extracted by steam distillation and tested for their insecticidal activities against sitophilus zeamats motsch. responses varied with the test applied and the plant species. for the contact toxicity, the acetone was used in order to dilute the pure essential oil. formulations of 1% of essential oils of xylopia aethiopica and ocimum gratissimum were the most toxic and led to 96 and 98% of mortality respectively after 24 h. ... | 2005 | 16628918 |
| interactions between acetoin, a plant volatile, and pheromone in rhynchophorus palmarum: behavioral and olfactory neuron responses. | aggregation of rhynchophorus palmarum weevils on host plants is mediated by a male pheromone (rhynchophorol: r) and host-plant volatiles (pvs) acting in synergy. synthetic pv blends synergizing pheromone contain acetoin (a) and ethyl acetate (etac). r, a, and etac are detected by specialized olfactory receptor neurons (orns). in addition, particular types of orns are tuned to both a and r. to specify the role played by acetoin in pheromone perception, we recorded the responses of orns to 100 ng ... | 2005 | 16222808 |
| chemically mediated host-plant selection by the milfoil weevil: a freshwater insect-plant interaction. | the milfoil weevil euhrychiopsis lecontei is a specialist aquatic herbivore that feeds, oviposits, and mates on the invasive freshwater macrophyte myriophyllum spicatum. we characterized the weevil's preference for m. spicatum, and through bioassay-driven fractionation, isolated and identified two chemicals released by m. spicatum that attract e. lecontei. mass spectrometry and nuclear magnetic resonance spectroscopy were used to identify the attractive compounds as glycerol and uracil. dose-res ... | 2005 | 16365710 |
| pollination of australian macrozamia cycads (zamiaceae): effectiveness and behavior of specialist vectors in a dependent mutualism. | complementary field and laboratory tests confirmed and quantified the pollination abilities of tranes sp. weevils and cycadothrips chadwicki thrips, specialist insects of their respective cycad hosts, macrozamia machinii and m. lucida. no agamospermous seeds were produced when both wind and insects were excluded from female cones; and the exclusion of wind-vectored pollen alone did not eliminate seed set, because insects were able to reach the cone. based on enclosure pollination tests, each wee ... | 2005 | 21652476 |
| sexes show differential tolerance to spittlebug damage and consequences of damage for multi-species interactions. | antagonists can play a role in sexual system evolution if tolerance or resistance is sex-dependent. our understanding of this role will be enhanced by consideration of the effects of antagonists on other plant-animal interactions. this study determined whether the sex morphs of a gynodioecious fragaria virginiana differ in their susceptibility and response to damage by spittlebugs and whether damage altered pollinator attraction traits or interactions with other antagonists. tolerance, but not r ... | 2005 | 21646088 |
| ethanol and (-)-alpha-pinene: attractant kairomones for some large wood-boring beetles in southeastern usa. | ethanol and alpha-pinene were tested as attractants for large wood-boring pine beetles in alabama, florida, georgia, north carolina, and south carolina in 2002-2004. multiple-funnel traps baited with (-)-alpha-pinene (released at about 2 g/d at 25-28 degrees c) were attractive to the following cerambycidae: acanthocinus nodosus, a. obsoletus, arhopalus rusticus nubilus, asemum striatum, monochamus titillator, prionus pocularis, xylotrechus integer, and x. sagittatus sagittatus. buprestis lineata ... | 2006 | 16586033 |
| microsporidia infect the liophloeus lentus (insecta, colepotera) ovarioles, developing oocytes and eggs. | in the ovarioles of liophloeus lentus (insecta, coleoptera, curculionidae) two types of bacteria and parasitic microorganisms belonging to microsporidia have been found. this study shows that the different microsporidian life stages (meronts, sporonts, sporoblasts and spores) infect the outer ovariole sheath, trophic chambers, follicular cells, late previtellogenic and vitellogenic oocytes and eggs. in trophic chambers the parasites are very abundant and are distributed unevenly, i.e. their larg ... | 2006 | 17044262 |
| [occurrence of the mite pyemotes sp. (acari: pyemotidae) in insect rearing in laboratory]. | pyemotidae mites have been reported as ectoparasites of a large number of arthropods, especially of insects. these mites are frequently found attacking insects in different habitats, including insect rearing. this paper reports the occurrence of pyemotes sp., ventricosus group, in colonies of tuta absoluta (meyerick) (lepidoptera: gelechiidae), anagasta kuehniella (zeller) (lepidoptera: pyralidae) and sitophilus zeamais motschulsky (coleoptera: curculionidae), in the insect rearing laboratory of ... | 2006 | 17061810 |
| grandlure dosage and attraction of boll weevils (coleoptera: curculionidae). | the effects of grandlure dosage on of boll weevil, anthonomus grandis grandis boheman (coleoptera: curculionidae), attraction were assessed. traps collected more boll weevils under field and laboratory conditions as the amount of grandlure in laminated plastic strips was increased from 0 to 10, 30, and 60 mg. spreading the point source of the lure by cutting the strip into quarters and positioning each quarter on separate corners of the large capacity trap to create an expanded source for the ph ... | 2006 | 17066798 |
| effect of root feeding by diaprepes abbreviatus (coleoptera: curculionidae) larvae on leaf gas exchange and growth of three ornamental tree species. | diaprepes abbreviatus l. (coleoptera: curculionidae), feeds on a variety of ornamental plants grown in southern florida. studies were conducted to evaluate the effects of root feeding by d. abbreviatus larvae on leaf gas exchange and growth of three ornamental tree species commonly grown in southern florida that are known hosts of this weevil: green buttonwood, conocarpus erectus l.; live oak, quercus virginiana mill.; and pygmy date palm, phoenix roebelenii o'brien. these hosts were grown in co ... | 2006 | 16813316 |
| a yeast clade near candida kruisii uncovered: nine novel candida species associated with basidioma-feeding beetles. | yeasts similar to candida kruisii were isolated repeatedly from the digestive tracts of basidioma-feeding beetles, especially nitidulids inhabiting and feeding on a variety of agarics in the southeastern usa and barro colorado island, panama. based on the identical sequences of the d1/d2 domains of the lsu rrna gene (rdna) and host beetle information, the isolates were grouped into 19 genotypes which varied from c. kruisii by up to 38 nucleotide differences in the d1/d2 region. phylogenetic anal ... | 2006 | 17113766 |
| boll weevil (coleoptera: curculionidae) damage to cotton bolls under standard and proactive spraying. | in some parts of the boll weevil's, anthonomus grandis grandis (boheman) (coleoptera: curculionidae), distribution from the united states to argentina, insecticides are applied after cut-out (end of square production) when bolls are the predominant stage of fruiting body. this study demonstrates that the standard spray regime in southern texas, which involves insecticide applications after cut-out, did not result in more bolls than a nonsprayed control. an alternative "proactive" spray regime fo ... | 2006 | 16937679 |
| genes, enzymes and chemicals of terpenoid diversity in the constitutive and induced defence of conifers against insects and pathogens. | insects select their hosts, but trees cannot select which herbivores will feed upon them. thus, as long-lived stationary organisms, conifers must resist the onslaught of varying and multiple attackers over their lifetime. arguably, the greatest threats to conifers are herbivorous insects and their associated pathogens. insects such as bark beetles, stem- and wood-boring insects, shoot-feeding weevils, and foliage-feeding budworms and sawflies are among the most devastating pests of conifer fores ... | 2006 | 16684230 |
| comparisons of standard and extended-life boll weevil (coleoptera: curculionidae) pheromone lures. | the southeastern boll weevil eradication program has proposed reducing maintenance program costs in eradicated zones by using an extended-life "superlure" in traps to detect populations of the boll weevil, anthonomus grandis grandis boheman. however, superlure effectiveness has not been extensively evaluated. we compared the superlure (30 mg of eugenol plus 25 mg of grandlure) to a standard lure (10 mg of grandlure) based on captures of weevils and changes in lure pheromone content. lure treatme ... | 2006 | 16686129 |
| imaging and automated detection of sitophilus oryzae (coleoptera: curculionidae) pupae in hard red winter wheat. | computed tomography, an imaging technique commonly used for diagnosing internal human health ailments, uses multiple x-rays and sophisticated software to recreate a cross-sectional representation of a subject. the use of this technique to image hard red winter wheat, triticum aestivm l., samples infested with pupae of sitophilus oryzae (l.) was investigated. a software program was developed to rapidly recognize and quantify the infested kernels. samples were imaged in a 7.6-cm (o.d.) plastic tub ... | 2006 | 16686163 |
| antifeedants in the feces of the pine weevil hylobius abietis: identification and biological activity. | egg-laying females of the pine weevil, hylobius abietis (l.), regularly deposit feces adjacent to each egg. egg cavities are gnawed in the bark of roots of recently dead conifer trees. after egg deposition, the cavity is sealed by feces and a plug of bark fragments. root bark containing egg cavities with feces is avoided as food by pine weevils, which indicates the presence of natural antifeedants. here we present the first results of the isolation and chemical analyses of antifeedant compounds ... | 2006 | 16739015 |
| repeated cycles of chilling and warming effectively terminate prolonged larval diapause in the chestnut weevil, curculio sikkimensis. | curculio sikkimensis (coleoptera: curculionidae) requires one or more years to complete its life cycle, owing to prolonged larval diapause. to compare the effects of temperature cycles and total periods of chilling on the termination of prolonged diapause, larvae were subjected to different chilling (5 degrees c) and warming (20 degrees c) cycles ranging from 30 to 720 days, and all cycles were repeated until the sum of chilling and warming periods reached 720 days. the prolonged diapause of c. ... | 2006 | 16546207 |
| effectiveness of bifenthrin (onyx) and carbaryl (sevin sl) for protecting individual, high-value conifers from bark beetle attack (coleoptera: curculionidae: scolytinae) in the western united states. | high-value trees, such as those located in residential, recreational, or administrative sites, are particularly susceptible to bark beetle (coleoptera: curculionidae: scolytinae) attack as a result of increased amounts of stress associated with drought, soil compaction, mechanical injury, or vandalism. tree losses in these unique environments generally have a substantial impact. the value of these individual trees, cost of removal, and loss of esthetics may justify protection until the main thru ... | 2006 | 17066800 |
| improved dry-fleshed sweetpotato genotypes resistant to insect pests. | thirty-five mostly dry-fleshed sweetpotato, ipomoea batatas (l.) lam. (convolvulaceae), genotypes from the usda-ars/clemson university sweetpotato breeding program were evaluated in nine field experiments at the u.s. vegetable laboratory, charleston, sc, from 1998 to 2004. there were highly significant entry effects for percentage of uninjured roots; wireworm, diabrotica, and systena (wds) index; percentage of roots damaged by sweetpotato weevil, cylas formicarius elegantulus (summers); percenta ... | 2006 | 17066825 |
| [biological efficacy and persistence of biphenthrin sprayed on maize at different grain temperatures]. | the objective of this work was to evaluate the immediate and latent effects of the grain temperature, during the spraying process, on the persistence and biological efficacy of the biphenthrin insecticide against sitophilus zeamais motschulsky (coleoptera: curculionidae) and tribolium castaneum (herbst) (coleoptera: tenebrionidae). for such, biphenthrin was sprayed on the grain at the temperatures: 25, 30, 35, 40 and 45 degrees c. to access the persistence of biphenthrin, insecticide residue ana ... | 2006 | 17348140 |
| captures of boll weevils (coleoptera: curculionidae) in traps associated with different habitats. | programs to eradicate the boll weevil, anthonomus grandis grandis boheman, from cotton, gossypium hirsutum l., in the united states rely heavily on pheromone traps for monitoring weevil populations in both active and posteradication maintenance programs. modifications to trapping protocols that increase trap effectiveness should contribute to this eradication effort. between october 1996 and may 1997 and between september 1997 and april 1998, we compared trap effectiveness, indicated by the numb ... | 2006 | 16813308 |
| white pine weevil (pissodes strobi) biological performance is unaffected by the jasmonic acid or wound-induced defense response in norway spruce (picea abies). | in eastern canada, the white pine weevil (pissodes strobi peck) is a pest of several native pine and spruce species and of the introduced species, norway spruce (picea abies karst). we evaluated the feeding activities, oviposition and rate of adult emergence of white pine weevil on field-grown norway spruce subjected to jasmonic acid or wounding pretreatments. we also monitored the host-plant reaction to white pine weevil attack, jasmonic acid and wounding treatments by quantifying several mono- ... | 2006 | 16877323 |
| conifer defence against insects: microarray gene expression profiling of sitka spruce (picea sitchensis) induced by mechanical wounding or feeding by spruce budworms (choristoneura occidentalis) or white pine weevils (pissodes strobi) reveals large-scale changes of the host transcriptome. | conifers are resistant to attack from a large number of potential herbivores or pathogens. previous molecular and biochemical characterization of selected conifer defence systems support a model of multigenic, constitutive and induced defences that act on invading insects via physical, chemical, biochemical or ecological (multitrophic) mechanisms. however, the genomic foundation of the complex defence and resistance mechanisms of conifers is largely unknown. as part of a genomics strategy to cha ... | 2006 | 16898017 |
| effects of carbon dioxide on the searching behaviour of the root-feeding clover weevil sitona lepidus (coleoptera: curculionidae). | the respiratory emission of co2 from roots is frequently proposed as an attractant that allows soil-dwelling insects to locate host plant roots, but this role has recently become less certain. co2 is emitted from many sources other than roots, so does not necessarily indicate the presence of host plants, and because of the high density of roots in the upper soil layers, spatial gradients may not always be perceptible by soil-dwelling insects. the role of co2 in host location was investigated usi ... | 2006 | 16923203 |
| site of pheromone biosynthesis and isolation of hmg-coa reductase cdna in the cotton boll weevil, anthonomus grandis. | isolated gut tissue from male cotton boll weevil, anthonomus grandis (coleoptera: curculionidae), incorporated radiolabeled acetate into components that co-eluted with monoterpenoid pheromone components on hplc. this demonstrates that pheromone components of male a. grandis are produced de novo and strongly suggests that pheromone biosynthesis occurs in gut tissue. a central enzyme in isoprenoid biosynthesis is 3-hydroxy-3-methylglutaryl-coa reductase (hmg-r), and a full-length hmg-r cdna was is ... | 2006 | 16933277 |
| short-range dispersal and overwintering habitats of boll weevils (coleoptera: curculionidae) during and after harvest in the subtropics. | field experiments in the subtropical lower rio grande valley of texas were conducted to determine the extent of adult boll weevil, anthonomus grandis grandis boheman (coleoptera: curculionidae), dispersal from cotton, gossypium hirsutum l., fields during harvest operations and the noncotton-growing ("overwinter") period between 1 september and 1 february. using unbaited large capacity boll weevil traps placed at intervals extending outward from commercial field edges, boll weevils did not move i ... | 2006 | 16937667 |
| structure-activity relationships of benzoic acid derivatives as antifeedants for the pine weevil, hylobius abietis. | aromatic organic compounds found in the feces of the pine weevil, hylobius abietis (l.) (coleoptera: curculionidae), have been shown to deter feeding behavior in this species, which is a serious pest of planted conifer seedlings in europe. we evaluated 55 benzoic acid derivatives and a few homologs as antifeedants for h. abietis. structure-activity relationships were identified by bioassaying related compounds obtained by rational syntheses of functional group analogs and structural isomers. we ... | 2006 | 17013662 |
| laboratory evaluation of flight performance of the plum curculio (coleoptera: curculionidae). | flight performance of laboratory-reared adults of the plum curculio, conotrachelus nenuphar (herbst) (coleoptera: curculionidae), was investigated under controlled conditions by using a flight mill system. across all insects tested (n=198), median values of total distance traveled, total flight time, and maximum uninterrupted flight time were 122.7 m day(-1), 23.5 min day(-1), and 2.0 min, respectively. the latter result indicates that flight occurred primarily in short bursts. although females ... | 2006 | 17195674 |
| demographic models inform selection of biocontrol agents for garlic mustard (alliaria petiolata). | nonindigenous invasive plants pose a major threat to natural communities worldwide. biological control of weeds via selected introduction of their natural enemies can affect control over large spatial areas but also risk nontarget effects. to maximize effectiveness while minimizing risk, weed biocontrol programs should introduce the minimum number of host-specific natural enemies necessary to control an invasive nonindigenous plant. we used elasticity analysis of a matrix model to help inform bi ... | 2006 | 17205913 |
| electrophysiological and behavioral responses of a cuban population of the sweet potato weevil to its sex pheromone. | the sex pheromone of feral sweet potato weevils cylas formicarius elegantulus from cuba was found, via solid-phase microextraction analysis, to be identical to (z)-3-dodecenyl (e)-2-butenoate, a previously reported compound. females emitted 20 pg pheromone d(-1). in scanning electron microscopy studies carried out on the male antenna, we identified several types of sensilla: sensilla trichoidea of type 1 (st1) as long hairs (100-150 microm), sensilla trichoidea of type 2 as short hairs (50-60 mi ... | 2006 | 16977491 |
| comparative susceptibility of sweetpotato weevil (coleoptera: brentidae) to selected insecticides. | the response of sweetpotato weevil, cylas formicarius (f.) (coleoptera: brentidae), to insecticides used for its control was tested in laboratory bioassays. a glass vial bioassay technique was used to determine the susceptibility of two cohorts of sweetpotato weevil to selected insecticides. vials were treated with methyl parathion, bifenthrin, cyfluthrin, carbaryl, and phosmet. sweetpotato weevils demonstrated a mortality response to increasing concentrations of all insecticides tested, and our ... | 2006 | 17195669 |
| karyotypic characterization of three weevil species (coleoptera: curculionidae, brachyderini). | karyotypes of three species, brachyderes incanus, brachysomus setiger and paophilus afflatus, belonging to the tribe brachyderini, were studied using c-banding technique. the species share the same chromosome number 2n = 22 and meioformula n = 10+xy(p) at all metaphase 1 plates of spermatid division. some differences between karyotypes were observed in terms of centromere positions and c-band sizes. most chromosomes are meta- or submetacentric and form a graded series in respect to length. the c ... | 2006 | 17044254 |
| effects of nitrogen fertilizer applied before permanent flood on the interaction between rice and rice water weevil (coleoptera: curculionidae). | nitrogen fertilizer was applied to rice, oryza sativa l., before permanent flood to determine the interaction between rice and the rice water weevil, lissorhoptrus oryzophilus kuschel (coleoptera: curculionidae), through a series of experiments conducted over a 3-yr period in texas and louisiana. both absolute and relative percentage of yield loss because of l. oryzophilus feeding was not affected by fertilizer rates in the texas experiment. absolute yield loss increased with nitrogen rates in 2 ... | 2006 | 17195670 |
| natural efficiency of parasitism by billaea rhynchophorae (blanchard) (diptera: tachinidae) for the control of rhynchophorus palmarum (l.) (coleoptera: curculionidae). | the occurrence of the tachinid parasitoid billaea rhynchophorae (blanchard) on larvae of the palm weevil rhynchophorus palmarum (l.) was evaluated in plantations of piassava palm (attalea funifera mart.) and african oil palm (elaeis guineensis jacquin), in southeastern bahia, brazil. the monthly percentages of parasitism were evaluated during 13 months, from november 2000 to november 2001, based on the comparison between the number of parasitized and non-parasitized cocoons of r. palmarum. mean ... | 2006 | 17348142 |
| navia, a replacement generic name for euterpia navia & flechtmann (prostigmata: eriophyoidea: eriophyidae). | navia nom. nov. is proposed for euterpia navia & flechtmann, 2005 (prostigmata: eriophyoidea), preoccupied by euterpia bondar, 1942 (insecta: coleoptera: curculionidae). | 2006 | 17273724 |
| coffee berry borer hypothenemus hampei (coleoptera: curculionidae): searching for sustainable control strategies. | the coffee berry borer hypothenemus hampei (ferrari) is the most serious pest of the world's most valuable tropical export crop. since the last review on this insect was published six years ago, many new studies have contributed to an improved insight into the biology and ecology of the beetle, and have indicated new avenues for integrated and biological control. the latest developments in research, both laboratory and field, on the pest, its natural enemies and their implications for integrated ... | 2006 | 16768810 |
| potential of mass trapping for long-term pest management and eradication of invasive species. | semiochemical-based pest management programs comprise three major approaches that are being used to provide environmentally friendly control methods of insect pests: mass trapping, "lure and kill," and mating disruption. in this article, we review the potential of mass trapping in long-term pest management as well as in the eradication of invasive species. we discuss similarities and differences between mass trapping and other two main approaches of semiochemical-based pest management programs. ... | 2006 | 17066782 |
| virus-like particles in the ovaries of microctonus aethiopoides loan (hymenoptera: braconidae): comparison of biotypes from morocco and europe. | virus-like particles (mavlp) have been discovered in the ovarial epithelial cells of the solitary, koinobiont, endoparasitoid, microctonus aethiopoides loan (hymenoptera: braconidae) introduced to new zealand originally from morocco to control the lucerne pest sitona discoideus gyllenhal (coleoptera: curculionidae). mavlp have been found in all females examined. it has been suggested, although not demonstrated, that like many other such vlp found in parasitoids, mavlp might play a role in host i ... | 2006 | 16375917 |
| dirigent proteins in conifer defense: gene discovery, phylogeny, and differential wound- and insect-induced expression of a family of dir and dir-like genes in spruce (picea spp.). | the outer stem tissues of conifers provide a durable constitutive and inducible defense barrier consisting of suberized or lignified periderm, sclereids, a network of terpenoid-filled resin ducts, and phenolic phloem parenchyma cells. microarray gene expression profiling of sitka spruce (picea sitchensis) bark attacked by stem-boring weevils (pissodes strobi) or through mechanical wounding demonstrated significant accumulation of transcripts resembling dirigent protein (dir) genes. to investigat ... | 2006 | 16463097 |
| yield and forage quality of glandular-haired alfalfa under alfalfa weevil (coleoptera: curculionidae) and potato leafhopper (hemiptera: cicadellidae) pest pressure in virginia. | cultivars of glandular-haired alfalfa, medicago sativa l., such as '54h69', are currently available and marketed as being resistant to potato leafhopper, empoasca fabae (harris) (hemiptera: cicadellidae). 54h69 and a standard, nonglandular-haired alfalfa 'choice' were evaluated at two locations in virginia over a 3-yr period. dry matter yields and concentrations of crude protein and acid detergent fiber were compared at the first, second, and third harvests. overall, the two cultivars produced s ... | 2006 | 16937677 |
| early impact of endoparasitoid microctonus hyperodae (hymenoptera: braconidae) after its establishment in listronotus bonariensis (coleoptera: curculionidae) populations of northern new zealand pastures. | the south american curculionid listronotus bonariensis (kuschel) is an important pest of pastures in new zealand. population census data were gathered for l. bonariensis in northern new zealand pastures during 1980-1983 in the absence of parasitism and again in 1991-1996 after the introduction and establishment of the braconid parasitoid microctonus hyperodae loan as a biological control agent. m. hyperodae achieved high rates of parasitism, with 75-90% of overwintering l. bonariensis parasitize ... | 2006 | 16686124 |
| [phylogenetic reconstruction of weevil superfamily curculionoidea (coleoptera) using the synap method]. | phylogenetic relationships within the superfamily curculionoidea were reconstructed. autapomorphies of the superfamily curculionoidea include more or less pronounced snout, clubbed antennae, and partially sclerotized or completely membranous male tergite 9. weevil families can be divided into three groups. the first group includes the most primitive family nemonychidae. the second group includes nine families (anthribidae, belidae, oxycorynidae, eccoptarthridae, allocorynidae, rhynchitidae, atte ... | 2006 | 16634433 |
| evaluation of insecticides for protecting southwestern ponderosa pines from attack by engraver beetles (coleoptera: curculionidae: scolytinae). | insecticides that might protect pine trees from attack by engraver beetles (ips spp.) have not been rigorously tested in the southwestern united states. we conducted two field experiments to evaluate the efficacy of several currently and potentially labeled preventative insecticides for protecting high-value ponderosa pine, pinus ponderosa dougl ex. laws., from attack by engraver beetles. preventative sprays (0.19% permethrin [permethrin plus c]; 0.03, 0.06, and 0.12% bifenthrin [onyx]; and 1.0 ... | 2006 | 16686137 |
| an experiment using neutron activation analysis and a rare earth element to mark cotton plants and two insects that feed on them. | studies on insect dispersal and other behaviors can benefit from using markers that will not alter flight and fitness. rare earth elements, such as samarium (sm), have been used as ingested markers of some insects and detected using neutron activation analysis (naa). in this study, samarium nitrate hexahydrate was mixed into artificial diet for boll weevils, anthonomus grandis grandis boheman (coleoptera: curculionidae), at different dosages and in water used to irrigate cotton, gossypium hirsut ... | 2006 | 16713273 |
| fitness consequences of pheromone production and host selection strategies in a tree-killing bark beetle (coleoptera: curculionidae: scolytinae). | timing of arrival at a resource often determines an individual's reproductive success. tree-killing bark beetles can reproduce in healthy trees by attacking in adequate numbers to overcome host defences that could otherwise be lethal. this process is mediated by aggregation and antiaggregation pheromones. beetles that arrive early in such a "mass attack" must contend with undiminished tree defences, and produce enough pheromones to attract more beetles, but have a head start on gallery construct ... | 2006 | 16609873 |
| population regulation of a classical biological control agent: larval density dependence in neochetina eichhorniae (coleoptera: curculionidae), a biological control agent of water hyacinth eichhornia crassipes. | the release of classical biological control agents has reduced the economic, environmental and social problems caused by water hyacinth, eichhornia crassipes; however, additional control measures are needed in some locations. water hyacinth plants were treated with different densities of eggs of the weevil neochetina eichhorniae warner, one of the main control agents, under different nutrient regimes in a controlled experiment. plants were destructively sampled and the development of n. eichhorn ... | 2006 | 16556335 |
| irradiation as a methyl bromide alternative for postharvest control of omphisa anastomosalis (lepidoptera: pyralidae) and euscepes postfasciatus and cylas formicarius elegantulus (coleoptera: curculionidae) in sweet potatoes. | irradiation studies were conducted with three sweet potato, ipomoea batatas (l.) lam., pests to determine an effective dose for quarantine control. dose-response tests indicated that the most radiotolerant stage occurring in roots was the pupa of sweetpotato vine borer, omphisa anastomosalis (guenee), and the adult of west indian sweetpotato weevil, euscepes postfasciatus (fairmaire), and sweetpotato weevil, cylas formicarius elegantulus (summers). in large-scale confirmatory tests, irradiation ... | 2006 | 16573320 |
| dispersal of boll weevils (coleoptera: curculionidae) from cotton modules before ginning. | we characterized the level of risk of boll weevil, anthonomus grandis grandis boheman, reintroduction to an eradication zone posed by dispersal from cotton modules during and after transport to the gin. mark-release-recapture experiments in august and september in texas indicated that most weevils disperse rapidly from the module surface, temperature permitting, unless confined under a module tarp, where most died. nevertheless, 1-5% of released weevils were recovered alive after 24 h on the sid ... | 2006 | 16573325 |
| efficacy of systemic insecticides for protection of loblolly pine against southern pine engraver beetles (coleoptera: curculionidae: scolytinae) and wood borers (coleoptera: cerambycidae). | we evaluated the efficacy of the systemic insecticides dinotefuran, emamectin benzoate, fipronil, and imidacloprid for preventing attacks and brood production of southern pine engraver beetles (coleoptera: curculionidae: scolytinae) and wood borers (coleoptera: cerambycidae) on standing, stressed trees and bolt sections of loblolly pine, pinus taeda l., in eastern texas. emamectin benzoate significantly reduced the colonization success of engraver beetles and associated wood borers in both stres ... | 2006 | 16573328 |
| reduced oviposition by diaprepes abbreviatus (coleoptera: curculionidae) and growth enhancement of citrus by surround particle film. | regularly applied sprays of a particle film, surround wp, greatly enhanced the growth of citrus trees on a poorly drained winder soil at fort pierce, fl. after 3 yr of applications every 3 or 4 wk, surround-treated trees had at least 5 times the mass, 6 times the canopy volume, and approximately 4 times the cross-sectional area of the tree stems at the graft union compared with untreated trees. the larger surround-treated trees attracted a higher number of adult weevil diaprepes abbreviatus (l.) ... | 2006 | 16573330 |
| testing phylogeographic predictions on an active volcanic island: brachyderes rugatus (coleoptera: curculionidae) on la palma (canary islands). | volcanic islands with well-characterized geological histories can provide ideal templates for generating and testing phylogeographic predictions. many studies have sought to utilize these to investigate patterns of colonization and speciation within groups of closely related species across a number of islands. here we focus attention within a single volcanic island with a well-characterized geological history to develop and test phylogeographic predictions. we develop phylogeographic predictions ... | 2006 | 16448412 |
| molecular modeling and inhibitory activity of cowpea cystatin against bean bruchid pests. | plant cystatins show great potential as tools to genetically engineer resistance of crop plants against pests. two important potential targets are the bean weevils acanthoscelides obtectus and zabrotes subfasciatus, which display major activities of digestive cysteine proteinases in midguts. in this study a cowpea cystatin, a cysteine proteinase inhibitor found in cowpea (vigna unguiculata) seeds, was expressed in escherichia coli and purified with a ni-nta agarose column. it strongly inhibited ... | 2006 | 16470583 |
| centrifugal partition chromatography as a tool for preparative purification of pea albumin with enhanced yields. | a new procedure including the use of centrifugal partition chromatography (cpc) is proposed to purify pa1b and its isoforms. these pea (pisum sativum l.) seed proteins are toxic against weevils and can be used as an environment-friendly insecticide. cpc was applied to a whole albumin fraction prepared from pea flour. the butanol:aqueous tfa system used in cpc allowed the separation of pa1b from other albumins and a degree of purification above 95%. compared to analytical procedures based on meth ... | 2007 | 16962392 |
| bean alpha-amylase inhibitors in transgenic peas inhibit development of pea weevil larvae. | this glasshouse study used an improved larval measurement procedure to evaluate the impact of transgenic pea, pisum sativum l., seeds expressing a-amylase inhibitor (ai)-1 or -2 proteins on pea weevil, bruchus pisorum l. seeds of transgenic 'laura' and 'greenfeast' peas expressing alpha-(ai)-1 reduced pea weevil survival by 93-98%. larval mortality occurred at an early instar. conversely, in nontransgenic cultivars, approximately 98-99% of the pea weevils emerged as adults. by measuring the head ... | 2007 | 17849896 |
| life history and larval morphology of eurhinus magnificus gyllenhal (coleoptera: curculionidae), a new weevil to the united states. | eurhinus magnificus gyllenhal has been collected in south florida, presumably introduced through trade with countries in its native range. very little information has been published on the biology or taxonomy of this insect. we conducted studies to investigate various aspects of its life history and host plant associations. the pre-imaginal life stages of e. magnificus are described for the first time. dimensions of the adult, egg, larval, and pupal stages are also provided; head capsule measure ... | 2007 | 17710321 |
| [evidences of moran effect in the population synchrony: a demonstration in experimental microcosm]. | three main causes to population synchrony are proposed: exogenous factors, dispersal and inter-specific interactions. this paper had as main goal to test the influence of the exogenous factors in the synchrony in spatially isolated (i.e., no dispersal) populations of sitophilus zeamais (mots.) (coleoptera: curculionidae), in microcosms with different environmental conditions (humidity, temperature and light intensity). twelve populations of 20 individuals each, were randomly assigned between two ... | 2007 | 18060290 |
| [biological characteristics of the egg phase of citrus root weevils]. | the goal of this work was to study some characteristics of the egg phase of three species of citrus root weevils. the insects were collected from citrus plants in itapetininga, sp, and brought to the laboratório de biologia de insetos of esalq/usp, in piracicaba, sp, where the species naupactus cervinus (boheman), naupactus versatilis (hustache) and parapantomorus fluctuosus (boheman) were kept. duration and viability of the egg phase were evaluated, and the lower temperature threshold and therm ... | 2007 | 17607451 |
| impact of combining planting date and chemical control to reduce larval densities of stem-infesting pests of sunflower in the central plains. | the guild of stem-infesting insect pests of sunflower, helianthus annuus l., within the central plains is a concern to producers chiefly due to losses caused by plant lodging from the sunflower stem weevil, cylindrocopturus adspersus (leconte) (coleoptera: curculionidae), and dectes texanus texanus leconte (coleoptera: cerambycidae). the incidence of a root boring moth, pelochrista womonana (kearfott) (lepidoptera: tortricidae), also has increased. experiments were conducted in three locations i ... | 2007 | 17849877 |
| biocontrol potential of lariophagus distinguendus (hymenoptera: pteromalidae) against sitophilus granarius (coleoptera: curculionidae) at low temperatures: reproduction and parasitoid-induced mortality. | lariophagus distinguendus forster (hymenoptera: pteromalidae) has been suggested as a biological control agent against the granary weevil, sitophilus granarius (l.), in grain stores. information on the effect of low temperatures prevailing in grain stores is necessary to be able to predict the potential of this parasitoid against s. granarius in temperate regions, where grain is cooled with ambient air to achieve safe storage conditions. the influence of constant temperatures of 16, 18, and 20 d ... | 2007 | 17598568 |
| larval densities and field hosts of ceratapion basicorne (coleoptera: apionidae) and an illustrated key to the adults of ceratapion spp. that feed on thistles in the eastern mediterranean and black sea regions. | many members of the tribe cardueae are invasive weeds, including yellow starthistle (centaurea solstitialis l.), one of the most important weeds in the western united states. we examined the root crowns and stems of yellow starthistle and related plants growing in five countries (armenia, republic of georgia, greece, russia, and turkey) where yellow starthistle is native. in its native range, the root crowns and lower stems of yellow starthistle are frequently attacked by the internal feeding la ... | 2007 | 18284770 |
| biology and preliminary host range assessment of two potential kudzu biological control agents. | two insect species from china, gonioctena tredecimmaculata (jacoby) (coleoptera: chrysomelidae) and ornatalcides (mesalcidodes) trifidus (pascoe) (coleoptera: curculionidae), were studied in quarantine in the united states as potential biological control agents for kudzu, pueraria montana variety lobata (willd.) maesen and s. almeida. adults of g. tredecimmaculata were ovoviviparous and reproduced throughout the summer, producing offspring that had an obligate adult diapause. in no-choice tests, ... | 2007 | 18284771 |
| microbial control of arthropod pests of tropical tree fruits. | a multitude of insects and mites attack fruit crops throughout the tropics. the traditional method for controlling most of these pests is the application of chemical pesticides. growing concern on the negative environmental effects has encouraged the development of alternatives. inundatively and inoculatively applied microbial control agents (virus, bacteria, fungi, and entomopathogenic nematodes) have been developed as alternative control methods of a wide variety of arthropods including tropic ... | 2007 | 17607448 |
| development of a meridic diet for hylobius transversovittatus (coleoptera: curculionidae) and the role of carbohydrates in feeding, growth, and survival of larvae. | the root-feeding weevil hylobius transversovittatus goeze (coleoptera: curculionidae) is used for biological control of the invasive plant purple loosestrife, luthrum salicaria l. (lythraceae). a simple rearing system for this weevil was developed with the goals of improving production techniques and increasing the availability of insects for field introduction. additionally, the dietary effects of digestible and indigestible carbohydrates were explored. a meridic diet for rearing h. transversov ... | 2007 | 17849852 |
| [genitalia of three species of heilipus germar (coleoptera: curculionidae) that damage avocado fruits (persea americana mill.) in mexico and costa rica]. | the male and female genitaliae of three species of the genus heilipus germar (h. lauri boheman, h. pittieri barber and h. trifasciatus fabricius) that damage avocado fruits (persea americana mill.) in mexico and costa rica are described and illustrated. the aedeagus, spiculum gastrale, styli of 8th sternite are different in each one of the three species studied and can be used for specific identification. | 2007 | 18246266 |
| bacterial endosymbiont of the slender pigeon louse, columbicola columbae, allied to endosymbionts of grain weevils and tsetse flies. | the current study focuses on a symbiotic bacterium found in the slender pigeon louse, columbicola columbae (insecta: phthiraptera). molecular phylogenetic analyses indicated that the symbiont belongs to the gamma subdivision of the class proteobacteria and is allied to sodalis glossinidius, the secondary symbiont of tsetse flies (glossina spp.) and also to the primary symbiont of grain weevils (sitophilus spp.). relative-rate tests revealed that the symbiont of c. columbae exhibits accelerated m ... | 2007 | 17766458 |
| [comparison of coleopteran and spider communities between a reforested area and a still steppe area in a pre-saharan region of algeria]. | in the pre-saharan region of djelfa (algeria), the coleopteran and spider communities are compared between two neighbouring ecosystems, the one kept as a steppe, the other one reforested with aleppo pine. in three plots in each area, pitfall (barber) traps were sampled monthly during one year and arthropods were identified and counted. two thousand five hundred and fifty-seven individuals, distributed into 95 species, were collected, belonging to four coleopteran families (carabidae, scarabaeida ... | 2007 | 18068651 |
| field parasitism of nontarget weevil species (coleoptera: curculionidae) by the introduced biological control agent microctonus aethiopoides loan (hymenoptera: braconidae) over an altitude gradient. | the parasitoid, microctonus aethiopoides loan (hymenoptera: braconidae) was introduced into new zealand in 1982 to control the alfalfa pest, sitona discoideus gyllenhal (coleoptera: curculionidae). studies have shown that a number of nontarget weevil species are attacked in the field by this parasitoid. a field study was carried out to investigate nontarget parasitism by m. aethiopoides over an altitudinal sequence from the target host habitat (alfalfa) into native grassland. three locations wer ... | 2007 | 17716473 |
| effect of summer drought relief on the impact of the root weevil cyphocleonus achates on spotted knapweed. | a recent decline in spotted knapweed, centaurea stoebe l. subsp. micranthos (asteraceae), has been observed in parts of western montana. the release of the biological control agent cyphocleonus achates (fahraeus) is thought to contribute to the decline, but persistent drought since at least 1999 may be an additional factor. we conducted outdoor plot experiments to test the relative impacts of c. achates weevils and summer drought relief on spotted knapweed survival and growth. groups of spotted ... | 2007 | 17716476 |
| distribution, abundance, and seasonal ecology of listronotus maculicollis (coleoptera: curculionidae) on golf courses in québec, canada. | the weevil listronotus maculicollis dietz (coleoptera: curculionidae) is a major pest of annual bluegrass, poa annua l., on golf courses in northeastern north america. to determine the distribution, abundance, and seasonal ecology of l. maculicollis on golf courses in québec, canada, we sampled 19 golf courses (gc1-gc19) from different geographic and climatic conditions during 2001, 2002, and 2003. l. maculicollis was found on all golf courses except gc19, which was located in northeastern québe ... | 2007 | 17849888 |
| a spatial analysis method (sam) to detect candidate loci for selection: towards a landscape genomics approach to adaptation. | the detection of adaptive loci in the genome is essential as it gives the possibility of understanding what proportion of a genome or which genes are being shaped by natural selection. several statistical methods have been developed which make use of molecular data to reveal genomic regions under selection. in this paper, we propose an approach to address this issue from the environmental angle, in order to complement results obtained by population genetics. we introduce a new method to detect s ... | 2007 | 17850556 |
| an ultrastructural study of spermiogenesis in two species of sitophilus (coleoptera: curculionidae). | the spermiogenesis of sitophilus zeamais and sitophilus oryzae, the maize and the rice weevil, respectively, was studied by light microscopy and scanning and transmission electron microscopy. sitophilus spp. is the most widespread and destructive primary pest of stored cereals in the world. the spermiogenesis occurs within cysts. there are approximately 256 germ line cells per cyst. inside each cysts, all the spermatids are in the same stage of maturation. the ultrastructure of the spermatozoa o ... | 2007 | 17902271 |
| [sexual dimorphism of guava weevil conotrachelus psidii marshall (coleoptera: curculionidae)]. | we investigate structural and behavioral differences between male and female adults of guava weevil, conotrachelus psidii marshall, 1922 to help in sex determination. weevils collected from a commercial guava orchard were individually caged and maintained under laboratory conditions. every day ten individuals were grouped and their behavior was observed. during mating the males and females were identified. fifty weevils of each sex were killed and they were observed with stereoscopic microscope. ... | 2007 | 17934614 |
| impact of irrigation on larval density of stem-infesting pests of cultivated sunflower in kansas. | the guild of stem-infesting insect pests of cultivated sunflower, helianthus annuus l., within the central plains is a concern to producers, chiefly due to losses caused by plant lodging from the sunflower stem weevil, cylindrocopturus adspersus (leconte) (coleoptera: curculionidae), and dectes texanus texanus leconte (coleoptera: cerambycidae). the incidence of a root boring moth, pelochrista womonana (kearfott) (lepidoptera: tortricidae), also has increased. experiments were conducted in kansa ... | 2007 | 17972632 |
| population structure of the banana weevil, an introduced pest in the canary islands, studied by rapd analysis. | the banana weevil (bw), cosmopolites sordidus (coleoptera: curculionidae), is one of the most important insect pests of bananas and plantains. the mobility and the origin of bw infestations at the canary islands (tenerife, la gomera and la palma) have been analysed using random amplified polymorphic dna (rapd) as molecular markers. populations from costa rica, colombia, uganda and madeira were also included for comparison. one hundred and fifteen reproducible bands from eight primers were obtain ... | 2007 | 17997871 |
| instar determination for pissodes castaneus (coleoptera: curculionidae) using head capsule widths and lengths. | the aim of this research was to assess the larval instar number of pissodes castaneus (de geer) and to facilitate the study of its biology by identifying a reliable method to determine the instar of individual larvae. the larvae of this weevil were collected in central italy in 2004, and their head capsules were measured by means of a binocular microscope. head capsule width and length data were analyzed using hcap, a computer program that use the distribution of size measures to determine insta ... | 2007 | 18284728 |
| pollination of anthurium (araceae) by derelomine flower weevils (coleoptera: curculionidae). | cyclanthura flower weevils (coleoptera: curculionidae: derelomini) are identified for the first time as pollinators of multiple species of anthurium (araceae) in costa rica. the weevils are present on the inflorescences in small numbers during the pistillate and staminate phase of anthesis, and consume plant tissues and pollen. the individuals of one species of cyclanthura can visit several anthurium species within the same locality. they also engage in reproductive activities and are likely to ... | 2007 | 18457136 |
| aggregation pheromone of metamasius spinolae (coleoptera: curculionidae): chemical analysis and field test. | male metamasius spinolae (gylh.) produce several volatile compounds that are likely constituents of its aggregation pheromone. these compounds were identified by volatile collections and gas chromatography (gc), followed by coupled gas chromatography-mass spectrometry (gc-ms), as 2-methyl-4-heptanone [1], 6-methyl-2hepten-4-one [2], and 2-hydroxy-2-methyl-4-heptanone [3]. preliminary field experiments using synthetic racemates of these compounds showed that significantly more adult cactus weevil ... | 2007 | 17349116 |
| heteropriapulus nom. nov. (monogenoidea: dactylogyridae) for heterotylus jogunoori, kritsky & venkatanarasaiah, 2004, a junior homonym of heterotylus kirsch in reitter, 1913 (coleoptera: curculionidae). | heterotylus jogunoori, kritsky & venkatanarasaiah, 2004 is a junior homonym of heterotylus kirsch in reitter, 1913. it is replaced by heteropriapulus nom. nov. and its type- and only species, heterotylus heterotylus jogunoori, kritsky & venkatanarasaiah, 2004, is transferred as heteropriapulus heterotylus (jogunoori, kritsky & venkatanarasaiah, 2004) n. comb. | 2007 | 17896191 |
| orange reflection from a three-dimensional photonic crystal in the scales of the weevil pachyrrhynchus congestus pavonius (curculionidae). | the three-dimensional structure that causes the coloration of the tropical weevil pachyrrhynchus congestus pavonius was studied, using a combination of electron microscopy, optical spectroscopy, and numerical modeling. the orange scales that cover the colored rings on the animal's body were opened, to display the structure responsible for the coloration. this structure is a three-dimensional photonic polycrystal, each grain of which showing a face-centered cubic symmetry. the measured lattice pa ... | 2007 | 17500933 |
| temporal variation in mycophagy and prevalence of fungi associated with developmental stages of dendroctonus ponderosae (coleoptera: curculionidae). | mycophagy by bark beetles is widespread. however, little is known regarding which developmental stages of bark beetles actually feed on fungi. to study this question, we sampled fungi associated with dendroctonus ponderosae hopkins (coleoptera: curculionidae) throughout development in naturally attacked trees. isolations of fungi were made from phloem adjacent to brood and from brood exoskeletons and guts. overall, the incidence of fungi with individual brood increased as brood development progr ... | 2007 | 17349118 |