Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
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| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| [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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| response to host volatiles by native and introduced populations of dendroctonus valens (coleoptera: curculionidae, scolytinae) in north america and china. | bark beetles (coleoptera: curculionidae, scolytinae) have specialized feeding habits, and commonly colonize only one or a few closely related host genera in their geographical ranges. the red turpentine beetle, dendroctonus valens leconte, has a broad geographic distribution in north america and exploits volatile cues from a wide variety of pines in selecting hosts. semiochemicals have been investigated for d. valens in north america and in its introduced range in china, yielding apparent region ... | 2007 | 17160720 |
| oogenesis in summer females of the rice water weevil, lissorhoptrus oryzophilus kuschel (coleoptera: curculionidae), in southern zhejiang, china. | the rice water weevil, lissorhoptrus oryzophilus kuschel, has two generations in southern zhejiang, china. to determine oogenesis in first-generation females (summer females) and its relations to temperature, females were collected from a rice field in early and mid-july and reared on young rice plants at 28, 31 and 34 degrees c in the laboratory. percentage of females having oocytes, number of oocytes of different stages (stage-i, from early previtellogenesis to middle vitellogenesis; stage-ii, ... | 2007 | 17173360 |
| 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 |
| 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 |
| 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 |
| conifer defense against insects: proteome analysis of sitka spruce (picea sitchensis) bark induced by mechanical wounding or feeding by white pine weevils (pissodes strobi). | feeding insects can have major ecological and economic impacts on both natural and planted forests. understanding the molecular and biochemical mechanisms by which conifers defend themselves from insect pests is a major goal of ongoing research in forest health genomics. in previous work, we demonstrated a complex system of anatomical, chemical, and transcriptome responses in sitka spruce (picea sitchensis) upon feeding by the economically significant insect pest, the white pine weevil (pissodes ... | 2007 | 17205607 |
| 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 |
| genetic polymorphism and evolution in parthenogenetic animals. i. polyploid curculionidae. | the genetic variability at enzyme loci in different triploid and tetraploid parthenogenetic weevil populations has been elucidated by starch gel electrophoresis. the overall genotype of individual weevils belonging to different populations has been determined for over 25 loci. the results are compared with those obtained for diploid bisexual races of either the same or closely related species. the variation within a parthenogenetic population differs from that in diploid, sexually reproducing po ... | 1973 | 17248626 |
| 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 |
| genetic diversity of brazilian natural populations of anthonomus grandis boheman (coleoptera: curculionidae), the major cotton pest in the new world. | twenty-five rapd loci and 6 isozyme loci were studied to characterize the genetic variability of natural populations of anthonomus grandis from two agroecosystems of brazil. the random-amplified polymorphic dna data disclosed a polymorphism that varied from 52 to 84% and a heterozygosity of 0.189 to 0.347. the index of genetic differentiation (gst) among the six populations was 0.258. the analysis of isozymes showed a polymorphism and a heterozygosity ranging from 25 to 100% and 0.174 to 0.277, ... | 2007 | 17299893 |
| chemical cotton stalk destruction for maintenance of host-free periods for the control of overwintering boll weevil in tropical and subtropical climates. | in the lower rio grande valley (lrgv) of texas, cotton regrows and produces fruit from undestroyed stalks throughout the winter, and in spring weevils from such locations become a serious threat. the success of the boll weevil eradication program, which was reintroduced in the lrgv in 2005, will be dependent on thorough stalk destruction following harvest. however, adverse weather conditions and conservation tillage often impede immediate and complete stalk destruction using typical tool impleme ... | 2007 | 17348066 |
| [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 |
| 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 |
| 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 |
| 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 |
| influence of maternal age on the fitness of progeny in the rice weevil, sitophilus oryzae (coleoptera: curculionidae). | we studied the effects of maternal age on fitness of progeny in the rice weevil, sitophilus oryzae l. (coleoptera: curculionidae). five-, 20-, and 50-d-old female rice weevils were used to study the effects of maternal age on the lifetime fecundity and longevity of their daughters. in addition, we determined the effects of maternal age on the weight and survivorship of daughters' progeny. daughters of 5- and 20-d-old weevils lived longer, and the numbers and weights of the progeny of these daugh ... | 2007 | 17349120 |
| common subtropical and tropical nonpollen food sources of the boll weevil (coleoptera: curculionidae). | it is known that substantial boll weevil, anthonomus grandis grandis boheman, individuals can survive mild subtropical winters in some habitats, such as citrus orchards. our study shows that endocarp of the fruit from prickly pear cactus, opuntia engelmannii salm-dyck ex. engel.; orange, citrus sinensis l. osbeck.; and grapefruit, citrus paradisi macfad., can sustain newly emerged adult boll weevils for >5 mo, which is the duration of the cotton-free season in the subtropical lower rio grande va ... | 2007 | 17349122 |
| ips pini (curculionidae: scolytinae) is a vector of the fungal pathogen, sphaeropsis sapinea (coelomycetes), to austrian pines, pinus nigra (pinaceae). | sphaeropsis sapinea (fr.:fr.) dyko and sutton, is among the most common and widely distributed pathogens of conifers worldwide. s. sapinea is disseminated over short distances by rain splash and moist wind, but significant knowledge gaps regarding long-range dispersal remain. our objective was to determine whether or not the pine engraver beetle, ips pini say, is a vector of the pathogen onto austrian pines (pinus nigra arnold). in 2004 and 2005, individuals of i. pini were collected with pherom ... | 2007 | 17349124 |
| evaluation of puncture types as indicators of boll weevil (coleoptera: curculionidae) oviposition in cotton squares. | reproductive boll weevil populations are typically identified by the presence of a frass seal and protuberance at the oviposition site in cotton squares. however, despite the occurrence of other oviposition puncture seal types and their use in previous fecundity studies, the relationship of these respective puncture seal types and oviposition has not been clearly examined. in this study, newly eclosed females (<or=24 h old, but mated at 4 d of age) were fed fresh squares daily for 8 d to determi ... | 2007 | 17349132 |
| multi-trophic effects of ungulate intraguild predation on acorn weevils. | predators and parasitoids may contribute to controlling the population sizes of phytophagous insects, and this has been shown to benefit plants. phytophagous insects may also be killed by other herbivores (intraguild predation), usually larger-sized vertebrates that ingest insects accidentally while feeding on common food sources. we studied the intraguild predation on acorn weevils by ungulates and assessed the consequences for weevil populations. infested acorns are prematurely abscised and th ... | 2007 | 17351797 |
| a taxonomic revision, biology and morphology of immature stages of the entedon sparetus species group (hymenoptera: eulophidae), egg-larval endoparasitoids of weevils (coleoptera: curculionidae). | the sparetus-group of entedon is revised. six species are recognized for the group, including one new species, e. lucasi gumovsky sp. n., which is described from algeria. all species are either diagnosed or described, and illustrated, and new distribution records are provided. an illustrated dichotomous key to all species of the group is given. biology of two species, e. thomsonianus erdös and e. sparetus walker, is studied in detail: both species proved to be egg-larval parasitoids of stem-bori ... | 2007 | 17411478 |
| recalibrated tree of leaf beetles (chrysomelidae) indicates independent diversification of angiosperms and their insect herbivores. | the great diversity of the "phytophaga" (weevils, longhorn beetles and leaf beetles) has been attributed to their co-radiation with the angiosperms based on matching age estimates for both groups, but phylogenetic information and molecular clock calibrations remain insufficient for this conclusion. | 2007 | 17426809 |
| direct and indirect effects of a sex-biased antagonist on male and female fertility: consequences for reproductive trait evolution in a gender-dimorphic plant. | gender-dimorphic plants are often subject to sex-differential enemy attack, but whether and how this contributes to trait evolution is unknown. to address this gap, we documented the spatiotemporal prevalence of sex-biased weevil damage in a gynodioecious strawberry. we then conducted path analysis to evaluate the direct and indirect pathways for weevils to affect female and male fertility and to mediate selection in two experimental gardens. direct effects of weevils significantly reduced ferti ... | 2007 | 17427131 |
| susceptibility of the filbertworm (cydia latiferreana, lepidoptera: tortricidae) and filbert weevil (curculio occidentalis, coleoptera: curculionidae) to entomopathogenic nematodes. | the objective of this study was to determine the susceptibility of the two primary direct insect pests of hazelnuts in oregon to three species of entomopathogenic nematodes. the entomopathogenic nematodes (heterorhabditis marelatus pt. reyes, steinernema carpocapsae all and steinernema kraussei l137) were used in laboratory soil bioassays to determine their virulence against filbertworm, cydia latiferreana (walsingham) (lepidoptera: tortricidae) and filbert weevil, curculio occidentalis (casey) ... | 2007 | 17434523 |
| reproductive potential of overwintering, f1, and f2 female boll weevils (coleoptera: curculionidae) in the lower rio grande valley of texas. | the feeding and oviposition activity of overwintering boll weevils, anthonomus grandis grandis (boheman), and seasonal fluctuations in development, survival, and reproduction of progeny of overwintering and first- and second-generation boll weevil females were determined in the laboratory at 27 degrees c, 65% rh, and a photoperiod of 12:12 (l:d) h. during the cotton-free period in the lower rio grande valley, female boll weevils without access to cotton resorb their unlaid eggs and enter reprodu ... | 2007 | 17445359 |
| reproductive biology of fidiobia dominica (hymenoptera: platygastridae), an egg parasitoid of diaprepes abbreviatus (coleoptera: curculionidae). | the reproductive biology of fidiobia dominica evans (hymenoptera: platygastridae) was studied in the laboratory (25.6 +/- 1 degrees c) using host eggs of diaprepes abbreviatus l. (coleoptera: curculionidae). f. dominica readily parasitized d. abbreviatus eggs on both host plant and wax paper substrates. the number of egg masses parasitized and the number of offspring produced were higher when females were offered more than one host egg mass but did not differ when either two or three egg masses ... | 2007 | 17445372 |
| assessment of risk of introduction of cylas formicarius elegantulus (coleoptera: brentidae) into weevil-free areas in the southern united states. | we assessed the risk associated with introduction of sweet potato weevil, cylas formicarius elegantulus (summers) (coleoptera: brentidae), from infested areas to noninfested areas via shipment of sweet potato, ipomoea batatas (l.), roots within the southern united states. our study quantifies the effectiveness of risk mitigation procedures of sweet potatoes before shipment in relation to introduction of the weevil. the risk assessment relied on literature and expert information to determine appr ... | 2007 | 17461052 |
| impact of temperature on plum curculio (coleoptera: curculionidae) responses to odor-baited traps. | in 2005, captures of overwintered adult plum curculios, conotrachelus nenuphar (herbst) (coleoptera: curculionidae), in standard black masonite pyramid traps deployed in apple (malus spp.) orchards from half-inch green until fruit reached 7 mm and baited with known attractants did not result in significant captures compared with unbaited traps as they had in 2003 and 2004. these baits included the synthetic aggregation pheromone, grandisoic acid (ga) alone, a six-component synthetic host plant v ... | 2007 | 17461056 |
| fluctuating asymmetry in insecticide-resistant and insecticide-susceptible strains of the maize weevil, sitophilus zeamais (coleoptera: curculionidae). | insecticide resistance is an evolutionary response of specific insect populations subjected to exposure and consequent selection by an insecticide. as such, this phenomenon is important as a biomonitoring strategy and also has economical importance in the case of insect-pests by compromising their control. fluctuating asymmetry (fa) of bilateral traits is a measure of developmental instability also suggested as a monitoring tool for environmental pollution with potential consequences for fitness ... | 2007 | 17464442 |
| 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 |
| nutrient composition, mineral content and the solubility of the proteins of palm weevil, rhynchophorus phoenicis f. (coleoptera: curculionidae). | adult (ads) and larva stages of palm weevil rhynchophorus phoenicis were analyzed for their nutritional potentials using proximate and mineral contents as indices. the early larva stage (els) contains the highest moisture content of 11.94% while ads has the least value of 4.79%. the late larva stage (lls) has the highest protein content of 10.51% while ads contains 8.43%. ash content is highest in els with a value of 2.37% and lowest in ads with a value of 1.43%. els and lls have the highest (22 ... | 2007 | 17542059 |
| phylogeography of spruce beetles (dendroctonus rufipennis kirby) (curculionidae: scolytinae) in north america. | tree-feeding insects that are widespread in north temperate regions are excellent models for studying how past glaciations have impacted differentiation and speciation. we used mitochondrial dna (mtdna) sequences and allele frequencies at nine microsatellite loci to examine genetic population structure across the current range of the spruce beetle (dendroctonus rufipennis), an economically important insect in north america. two major haplotype groups occur across northern north america, from new ... | 2007 | 17561913 |
| competition between insecticide-susceptible and -resistant populations of the maize weevil, sitophilus zeamais. | insecticide resistance is an evolutionary response to insecticides and, as such, important for environmental biomonitoring and for pest management. fitness disadvantage in the absence of insecticide is a frequent assumption in models of insecticide resistance evolution, which was observed in different insect species. fitness studies are based in demographic performance of isolated populations without direct interaction between insecticide-resistant and -susceptible populations. here we reported ... | 2007 | 17570459 |
| interpopulation variation in predator foraging behaviour promotes the evolutionary divergence of prey. | despite intensive investigation of the role of predation on evolutionary processes, few studies have questioned the possibility of the evolutionary divergence of prey populations in response to interpopulation variation in predator foraging behaviour. in an interaction between a seed-predatory insect, the camellia weevil (curculio camelliae), and its host plant, the japanese camellia (camellia japonica), i tested whether the evolutionary differentiation of the plant's defensive trait, pericarp t ... | 2007 | 17584247 |
| dirigent proteins in conifer defense ii: extended gene discovery, phylogeny, and constitutive and stress-induced gene expression in spruce (picea spp.). | analysis of expressed sequence tags (ests) and full-length (fl)cdnas from species of spruce (picea spp.) revealed a family of 35 unique dirigent proteins (dir) and dir-like proteins. phylogenetic analysis indicates the spruce dir and dir-like genes cluster into three distinct subfamilies, dir-a, dir-b/d, and dir-f, of a larger plant dir and dir-like gene family. gene-specific primers were designed for 31 unique spruce dir family genes, and closely related isoforms, and used to evaluate patterns ... | 2007 | 17590394 |
| effect of irradiation on dispersal ability of male sweetpotato weevils (coleoptera: brentidae) in the field. | we used the mark-and-recapture method in the field to test the effect of gamma radiation on the dispersal ability of the male sweetpotato weevil, cylas formicarius elegantulus (summers) (coleoptera: brentidae), a serious sweetpotato pest in japan. to evaluate the dispersal ability of male sweetpotato weevil, we released 27,218 males (13,302 males irradiated with a dose of 200 gy and 13,916 nonirradiated males) in two replications (september and october 2005). each replication lasted 5 d from the ... | 2007 | 17598532 |
| impact of trap architecture, adjacent habitats, abiotic factors, and host plant phenology on captures of plum curculio (coleoptera: curculionidae) adults. | pyramid traps, 2.44 m and 3.66 m in height, were compared with standard-sized pyramid traps, 1.22 m in height, to assess the impact of trap architecture on captures of adult plum curculio, conotrachelus nenuphar (herbst) (coleoptera: curculionidae), in two apple (malus spp.) orchards and a blueberry (vaccinium spp.) planting. the effects of adjacent habitat (organic orchard versus wooded areas), abiotic factors, and phenological stages of apple also were assessed to determine whether these varia ... | 2007 | 17598533 |
| 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 |
| 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 |
| [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 |
| a review of the species of mesopolobus (chalcidoidea: pteromalidae) associated with ceutorhynchus (coleoptera: curculionidae) host-species of european origin. | four species of mesopolobus westwood were reared as parasitoids of ceutorhynchinae hosts in europe during surveys in 2000-2004. an illustrated key is given to differentiate the four species, m. gemellus baur & muller sp. n., m. incultus (walker), m. morys (walker) and m. trasullus (walker), plus m. moryoides gibson, a parasitoid of the cabbage seedpod weevil, ceutorhynchus obstrictus (marsham), in north america. pteromalus clavicornis walker is recognized as a junior synonym of m. incultus syn. ... | 2007 | 17645820 |
| high individual variation in pheromone production by tree-killing bark beetles (coleoptera: curculionidae: scolytinae). | aggregation via pheromone signalling is essential for tree-killing bark beetles to overcome tree defenses and reproduce within hosts. pheromone production is a trait that is linked to fitness, so high individual variation is paradoxical. one explanation is that the technique of measuring static pheromone pools overestimates true variation among individuals. an alternative hypothesis is that aggregation behaviour dilutes the contribution of individuals to the trait under selection and reduces the ... | 2008 | 17661002 |
| ophiostoma species (ascomycetes: ophiostomatales) associated with bark beetles (coleoptera: scolytinae) colonizing pinus radiata in northern spain. | bark beetles (coleoptera: scolytinae) are known to be associated with fungi, especially species of ophiostoma sensu lato and ceratocystis. however, very little is known about these fungi in spain. in this study, we examined the fungi associated with 13 bark beetle species and one weevil (coleoptera: entiminae) infesting pinus radiata in the basque country of northern spain. this study included an examination of 1323 bark beetles or their galleries in p. radiata. isolations yielded a total of 920 ... | 2007 | 17668036 |
| cross-correlation patterns of air and soil temperatures, rainfall and diaprepes abbreviatus root weevil in citrus. | time series cross-correlation analysis is appropriate when measuring relationships between two different time series. using this approach, the authors quantified the relationship between the time series air temperature (at), soil temperature (st), rainfall, relative humidity (rh) and diaprepes abbreviatus (l.) (coleoptera: curculionidae) root weevil across a period of 30 months, and examined how closely the distribution of diaprepes root weevil was related to at, st, rainfall and rh within this ... | 2007 | 17674428 |
| 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 |
| 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 |
| rhythms in pheromone production of the male boll weevil. | male boll weevils, anthonomus grandis, held in a light regimen of 16 hours of light and 8 hours of darkness released pheromone rhythmically during the 24 hours. the amount released during peaks was typically 20 times the amount released in valleys. the ratio of the two alcohol components of the pheromone also showed a daily rhythm. under continuous light, both the release of pheromone and the ratio of the two alcohol components were arrhythmic. in darkness, pheromone release was diminished more ... | 1978 | 17752372 |
| sex pheromones produced by male boll weevil: isolation, identification, and synthesis. | the response of female boll weevils to males, anthonomus grandis boheman, in laboratory bioassays can be reproduced by exposure to a mixture of compounds i, ii, and either iii or iv, all isolated from male weevils and their fecal material. the same response was elicited by mixtures of tile synthesized coimpounds. compound i is (+)-cis-2-isopropenyl-l-methylcyclobtutaneethanol; ii, cis-3,3-dimethiyl->(1,beta)cyclohexaneethanol; iii, cis-3,3-dimethlyl->(1,alpha)-cyclohexaneacetaldehyde; and iv, tr ... | 1969 | 17758066 |
| 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 |
| on the history of cottons and cotton weevils. | 1913 | 17793208 | |
| microbial control of insect pests in temperate orchard systems: potential for incorporation into ipm. | because of their selectivity and safety, microbial control agents (mcas) appear to be ready-made components of integrated pest management (ipm) systems that do not pose a threat to applicators or the environment and allow other natural enemies to function. control of several orchard pest insects using mcas, including viruses, bacillus thuringiensis, fungi, and entomopathogenic nematodes (epns), have been demonstrated in apple, pear, stone fruits, citrus, and several nut crops. b. thuringiensis i ... | 2008 | 17803454 |
| daily rhythm in the susceptibility of an insect to a toxic agent. | adult boll weevils exhibited a daily rhythm in their susceptibility to standardized doses of the insecticide, methyl parathion. the mortality produced by the insecticide was intimately related to the time of day at which the toxicant was applied. the rhythm appeared to be photoperiodically entrained and, regardless of the length of day or "clock time-of-day of treatment," a period of greatest resistance always occurred at dawn and recurred at 6-hour intervals throughout the 24-hour cycle. the gr ... | 1964 | 17814497 |
| weevils invade usda basic research plan. | 1984 | 17819486 | |
| head capsule transmission of long-wavelength light in the curculionidae. | the head capsule of many weevils contains a region that transmits only far-red and near-infrared light. in the alfalfa weevil, hypera postica, this extraocular cutoff filter evidently works in conjunction with the compound eyes, enabling the insect to use visual cues in locating or recognizing its host plant. | 1977 | 17837083 |
| dodder weevils in simultaneous association with parasitic plants and their hosts. | the weevil smicronyx quadrifer (broad sense) is restricted in host preference to the parasitic dodders (cuscuta species) durin its adult life, but its larvae consistently move from dodder stems into living stems of certain hosts of dodders, where they feed, grow to maturity, and undergo metamorphosis. such associations, involving three interacting organisms, are very unusual among phytogragous insects. | 1970 | 17838984 |
| flora and fauna on backs of large papuan moss-forest weevils. | large, living, flightless weevils feeding on leaves of woody plants high moss forest on various new guinea mountain ranges have plant growth on their backs. fungi and algae have been found on 11 species of gymnopholus, lichens on six species, and liverworts on one species. in other genera of weevils, on the same mountains, there are additional specific associations with fungi, algae, lichens, and liverworts. the fungi and lichens, at least, are inhabited by oribatid mites of a new family, which ... | 1965 | 17841980 |
| 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 |
| 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 |