| [persea schiedeana (lauraceae), a new host of heilipus lauri boheman (coleoptera: curculionidae) in veracruz, mexico]. | the presence of the molytinae heilipus lauri boheman is reported for the first time attacking fruits of persea schiedeana, commonly called 'chinene' in huatusco and zongolica, state of veracruz, mexico. | 2009 | 20098937 |
| analysis of cry8ka5-binding proteins from anthonomus grandis (coleoptera: curculionidae) midgut. | biotech crops expressing bacillus thuringiensis cry toxins present a valuable approach for insect control. cry8ka5, which is highly toxic to the cotton boll weevil (anthonomus grandis), was used as a model to study toxin-ligand interactions. three cry-binding proteins were detected after toxin overlay assays. following de novo sequencing, a heat-shock cognate protein and a v-atpase were identified, whilst a approximately 120 kda protein remained unknown. additional cry8ka5-binding proteins were ... | 2010 | 20144614 |
| preimaginal development response to constant temperatures in hypera postica (coleoptera: curculionidae): picking the best model. | immature survival and development of alfalfa weevil, hypera postica (gyllenhal) (coleoptera: curculionidae), were examined at 15 constant temperatures ranging from 9 to 37 degrees c. at 9 and 37 degrees c, eggs did not develop. embryos developed to adulthood between 11.5 and 36 degrees c, although survival was low at both ends of the temperature range. distribution of development times for all stages of alfalfa weevil were skewed toward longer times mainly at moderate temperatures. constant prop ... | 2010 | 20146855 |
| degree-day requirements for alfalfa weevil (coleoptera: curculionidae) development in eastern nebraska. | the alfalfa weevil, hypera postica (gyllenhal), is a serious, yet sporadic defoliator of alfalfa, medicago sativa l., in nebraska. a 2-yr study was conducted in 2005 and 2006 to test for variation in degree-day requirements by location in eastern nebraska. sampling took place along a latitudinal gradient in three regions of eastern nebraska. three fields were sampled in each region during the 2 yr of the study. alfalfa weevil larval degree-day requirements were found to vary by latitude in easte ... | 2010 | 20146858 |
| phosphine intoxication following oral exposure of horses to aluminum phosphide-treated feed. | 66 horses were potentially exposed to phosphine (a gas) 14 hours after being fed a pelleted ration treated with aluminum phosphide. | 2010 | 20151871 |
| dna-based taxonomy of larval stages reveals huge unknown species diversity in neotropical seed weevils (genus conotrachelus): relevance to evolutionary ecology. | high diversity in tropical phytophagous insects may be linked to narrow host specificity and host shifts, but tests are complicated by incomplete taxonomy and difficulties in food source identification. specimens of the highly diverse new world genus conotrachelus (coleoptera: curculionoidea) were reared from >17,500 fruits (seeds) at six central american rain forests. interception traps were used for comparison with assemblages flying in the forest. mitochondrial cox1 and the nuclear 28s genes ... | 2010 | 20188844 |
| insects and allies associated with bromeliads: a review. | bromeliads are a neotropical plant family (bromeliaceae) with about 2,900 described species. they vary considerably in architecture. many impound water in their inner leaf axils to form phytotelmata (plant pools), providing habitat for terrestrial arthropods with aquatic larvae, while their outer axils provide terraria for an assemblage of fully terrestrial arthropods. many bromeliads are epiphytic.dominant terrestrial arthropods with aquatic larvae inhabiting bromeliad phytotelmata are typicall ... | 2009 | 20209047 |
| response of tomicus yunnanensis (coleoptera: scolytinae) to infested and uninfested pinus yunnanensis bolts. | tomicus yunnanensis kirkendall and faccoli (coleoptera: curculionidae: scolytinae) is a newly described pine shoot beetle found in southwestern china. this beetle has affected >200,000 ha of pinus yunnanensis (franchet) forests over the past 30 yr. after maturation feeding in the shoots, adults attack the boles in december to produce a new generation. a hanging bolt study was initiated in november 2006 to detect the beetle flight patterns and to test if dispersing beetles respond to infested and ... | 2010 | 20214373 |
| effects of short exposures to spinosad-treated wheat or maize on four stored-grain insects. | the effect of short exposures to spinosad-treated wheat, triticum aestivum l., or maize, zea mays l., was evaluated against adults of four stored-product insect species: lesser grain borer, rhyzopertha dominica (f.) (coleoptera: bostrichidae); rice weevil, sitophilus oryzae (l.) (coleoptera: curculionidae); red flour beetle, tribolium castaneum (herbst) (coleoptera: tenebrionidae); and the psocid lepinotus reticulatus (enderlein) (psocoptera: trogiidae). adult mortality of these species was reco ... | 2010 | 20214387 |
| modified alpha-amylase activity among insecticide-resistant and -susceptible strains of the maize weevil, sitophilus zeamais. | fitness cost is usually associated with insecticide resistance and may be mitigated by increased energy accumulation and mobilization. preliminary evidence in the maize weevil (coleoptera: curculionidae) suggested possible involvement of amylases in such phenomenon. therefore, alpha-amylases were purified from an insecticide-susceptible and two insecticide-resistant strains (one with fitness cost [resistant cost strain], and the other without it [resistant no-cost strain]). the main alpha-amylas ... | 2010 | 20223242 |
| sunflower seed weevils and their control. | | 1946 | 20286294 |
| larval survival of fuller's rose weevil, naupactus cervinus, on common groundcover species in orchards of new zealand kiwifruit. | fuller's rose weevil, naupactus cervinus (boheman) (curculionidae: entiminae), is an important quarantine pest of new zealand kiwifruit exported to asian markets. both adults and larvae are considered to be polyphagous. in this study, the survival of larval n. cervinus was estimated on common groundcover species of kiwifruit (actinidia spp.) in the bay of plenty, the main region in new zealand where kiwifruit is grown. the botanical composition of groundcover in commercial kiwifruit orchards, ch ... | 2008 | 20298112 |
| extensive natural intraspecific variation in stoichiometric (c:n:p) composition in two terrestrial insect species. | heterotrophic organisms must obtain essential elements in sufficient quantities from their food. because plants naturally exhibit extensive variation in their elemental content, it is important to quantify the within-species stoichiometric variation of consumers. if extensive stoichiometric variation exists, it may help explain consumer variation in life-history strategy and fitness. to date, however, research on stoichiometric variation has focused on interspecific differences and assumed minim ... | 2008 | 20298114 |
| birch (betula spp.) leaves adsorb and re-release volatiles specific to neighbouring plants--a mechanism for associational herbivore resistance? | plant-emitted semi-volatile compounds have low vaporization rates at 20-25 degrees c and may therefore persist on surfaces such as plant foliage. the passive adsorption of arthropod-repellent semi-volatiles to neighbouring foliage could convey associational resistance, whereby a plant's neighbours reduce damage caused by herbivores. we found that birch (betula spp.) leaves adsorb and re-release the specific arthropod-repelling c(15) semi-volatiles ledene, ledol and palustrol produced by rhododen ... | 2010 | 20298484 |
| influence of temperature and humidity on the efficacy of spinosad against four stored-grain beetle species. | in the present work, we examined the insecticidal effect of spinosad, against adults of the lesser grain borer, rhyzopertha dominica (f.) (coleoptera: bostrychidae), the rice weevil, sitophilus oryzae (l.) (coleoptera: curculionidae), the confused flour beetle, tribolium confusum jacquelin du val (coleoptera: tenebrionidae) on wheat and the larger grain borer, prostephanus truncatus (horn) (coleoptera: bostrychidae) on maize. the dose rates used were 0.01, 0.1, 0.5 and 1 ppm. the bioassays were ... | 2008 | 20302538 |
| alternative food sources and overwintering feeding behavior of the boll weevil, anthonomus grandis boheman (coleoptera: curculionidae) under the tropical conditions of central brazil. | the boll weevil causes serious damage to the cotton crop in south america. several studies have been published on this pest, but its phenology and behavior under the tropical conditions prevailing in brazil are not well-known. in this study the feeding behavior and main food sources of adult boll weevils throughout the year in central brazil was investigated. the digestive tract contents of insects captured in pheromone traps in two cotton fields and two areas of native vegetation (gallery fores ... | 2010 | 20305896 |
| impact of the stem borer, dectes texanus, on yield of the cultivated sunflower, helianthus annuus. | foliar and soil-drench insecticide treatments were used in attempts to manipulate infestation of cultivated sunflower plants, helianthus annuus leconte (asterales: asteraceae) by dectes texanus leconte, (coleoptera: cerambycidae) a serious pest of sunflowers in the high plains of the usa. seed yields were assessed on a per-plant basis for both oilseed and confection type sunflower hybrids in two years. both insecticide treatments (foliar ë-cyhalothrin and soil-drench carbofuran) improved yield o ... | 2007 | 20307233 |
| a rapid decision sampling plan for implementing area-wide management of the red palm weevil, rhynchophorus ferrugineus, in coconut plantations of india. | the red palm weevil rhynchophorus ferrugineus olivier (curculionidae/rhynchophoridae/dryophthoridae) is a lethal pest of young coconut palms, cocos nucifera l. (arecales: arecaceae), with a highly aggregated population distribution pattern. r. ferrugineus is managed in several coconut growing countries using area-wide pheromone based programmes that need a substantial commitment of funds over a period of time. often, decisions to implement area-wide management of r. ferrugineus are based on pher ... | 2008 | 20337561 |
| the tea weevil, myllocerinus aurolineatus, is attracted to volatiles induced by conspecifics. | the tea weevil, myllocerinus aurolineatus (voss) (coleoptera: curculionidae), is a leaf-feeding pest of camellia sinensis (o.ktze.) with aggregative behaviors that can seriously reduce tea yield and quality. although herbivore-induced host plant volatiles have been shown to attract conspecific individuals of some beetle pests, especially members of the chrysomelidae family, little is known about the volatiles emitted from tea plants infested by m. aurolineatus adults and their roles in mediating ... | 2010 | 20349338 |
| the lethal and sub-lethal consequences of entomopathogenic nematode infestation and exposure for adult pine weevils, hylobius abietis (coleoptera: curculionidae). | entomopathogenic nematodes (epn) frequently kill their host within 1-2 days, and interest in epn focuses mainly on their lethality. however, insects may take longer to die, or may fail to die despite being infected, but little is known about the effects of epn infection on insects, other than death. here we investigate both lethal and sub-lethal effects of infection by two epn species, steinernema carpocapsae and heterorhabditis downesi, on adults of the large pine weevil, hylobius abietis. foll ... | 2010 | 20382152 |
| analysis of wolbachia strains associated with conotrachelus nenuphar (coleoptera: curculionidae) in the eastern united states. | we studied the distribution patterns of wolbachia infection associated with plum curculio strains in eight states of the eastern united states. the presence of the wolbachia-specific gene wsp identified infections of this endosymbiont in 97.8% of the 93 samples tested. three distinct wolbachia strains were identified. the strains wcne1 (593 bp) and wcne2 (593 bp) were 97% identical, and their sequences were both 84% identical with wcne3 (590 bp). blastn searches through genbank showed strong sim ... | 2010 | 20388268 |
| geographic variation in bacterial communities associated with the red turpentine beetle (coleoptera: curculionidae). | bacterial communities are known to play important roles in insect life histories, yet their consistency or variation across populations is poorly understood. bacteria associated with the bark beetle dendroctonus valens leconte from eight populations, ranging from wisconsin to oregon, were evaluated and compared. we used the culture-independent technique of denaturing gradient gel electrophoresis to visualize bacterial diversity, or individual operational taxonomic units (otus), from individual b ... | 2010 | 20388269 |
| root deformation reduces tolerance of lodgepole pine to attack by warren root collar weevil. | surveys were conducted on regenerating stands of lodgepole pine to determine the relationship between root deformation and susceptibility to attack by the warren root collar weevil, hylobius warreni wood. the total number of trees attacked by h. warreni did not differ between planted and natural trees. a matched case-control logistic regression suggested that root cross-sectional area was more important in predicting weevil attack for naturally regenerated trees than for planted trees, but weevi ... | 2010 | 20388277 |
| characterization of an aggregation pheromone in hylesinus pruinosus (coleoptera: curculionidae: scolytinae). | we conducted laboratory and field bioassays to characterize the pheromone system of an ash bark beetle, hylesinus pruinosus eichhoff (coleoptera: curculionidae: scolytinae). solitary females in newly initiated galleries in ash logs produced (+)-exo-brevicomin, whereas male beetles paired with females produced (+)-endo-brevicomin, lesser quantities of (+)-exo-brevicomin, and a third compound that could not be identified. beetles produced these compounds also after exposure to juvenile hormone iii ... | 2010 | 20388297 |
| artificial diet optimized to produce normative adults of diaprepes abbreviatus (coleoptera: curculionidae). | the root weevil diaprepes abbreviatus l. has been continuously reared since 1992 on an artificial diet (f1675) first reported in 1982. the weight of weevils reared on f1675 was more than twice as great as field-collected individuals. recently, several ingredients included in the original f1675 diet were shown to have little or no effect on insect performance. we examined the effects of varying three ingredients of a simplified diet on the weight of adult d. abbreviatus. we used a geometric desig ... | 2010 | 20388301 |
| leptographium bhutanense sp. nov., associated with the root collar weevil hylobitelus chenkupdorjii on pinus wallichiana in bhutan. | leptographium spp. are commonly associated with bark beetles and weevils (coleoptera: curculionidae), and some are important tree pathogens. in a recent survey of diseases and insect pests of conifer trees in bhutan, the root collar weevil, hylobitelus chenkupdorjii was found girdling young himalayan blue pine (pinus wallichiana) trees in central bhutan. intensive wood staining and a leptographium sp. were associated with damage by this insect. the fungus was also isolated from individuals of h. ... | 2008 | 20396573 |
| potential of an indigenous strain of the entomopathogenic fungus beauveria bassiana as a biological control agent against the red palm weevil, rhynchophorus ferrugineus. | the potential of a strain of beauveria bassiana (ascomycota: clavicipitaceae) obtained from a naturally infected rhynchophorus ferrugineus (coleoptera: curculionidae) pupa as a biological control agent against this weevil was evaluated both in the laboratory and in semi-field assays. laboratory results indicate that this strain of b. bassiana can infect eggs, larvae and adults of r. ferrugineus (lc(50) from 6.3 x 10(7) to 3.0 x 10(9) conidia per ml). however, mortality was not the only indicator ... | 2010 | 20398670 |
| olive trees protected from the olive bark beetle, phloeotribus scarabaeoides (bernard 1788) (coleoptera, curculionidae, scolytinae) with a pyrethroid insecticide: effect on the insect community of the olive grove. | field studies were performed in two successive years, 2005 and 2006, in different olive groves of the province of granada (south-eastern spain) by spraying olive trees (olea europaea) with a pyrethroid insecticide, deltamethrin, for the control of the olive bark beetle phloeotribus scarabaeoides (bernard 1788) (coleoptera, curculionidae, scolytinae). three olive groves received each year three treatments in june consisting of water (control) and two insecticide doses, which were halved the secon ... | 2010 | 20413141 |
| modeling demographic response to constant temperature in hypera postica (coleoptera: curculionidae). | alfalfa weevil, hypera postica (gyllenhal) (coleoptera: curculionidae), is among the most destructive pests of alfalfa, medicago sativa l., in the world. survivorship and fecundity schedules of h. postica were investigated to characterize the population growth potential of the weevil at six constant temperatures: 11.5, 14.0, 19.0, 24.0, 29.0, and 31.5 degrees c. preoviposition period, oviposition period and female longevity significantly decreased with rising temperature within the temperature r ... | 2010 | 20429441 |
| nonlinear degree-day models for postdiapause development of the sunflower stem weevil (coleoptera: curculionidae). | the sunflower stem weevil, cylindrocopturus adspersus (leconte) (coleoptera: curculionidae), has caused yield losses across much of the western great plains. little is known about the field biology of this pest. simple prediction models, such as degree-day models, are an integral tool for development of c. adspersus management strategies. using data collected in colorado, kansas, and nebraska, we sought for predictable variation between c. adspersus pupation, adult eclosion, and emergence and ac ... | 2010 | 20429442 |
| boll weevil (coleoptera: curculionidae) response to and volatilization rates of grandlure when combined with varying doses of eugenol in the extended-life pheromone lure. | boll weevil, anthonomus grandis grandis boheman (coleoptera: curculionidae), trapping and pheromone quantitative analysis of extended-life pheromone lures manufactured with 0, 10, 20, and 30 mg of eugenol was conducted in the rio grande valley of texas under spring and summer conditions. boll weevils responded positively to eugenol on one of 12 trapping weeks when densities were high, but when densities were low (<2 weevils trap(-1) wk(-1)), there were no significant differences in captures for ... | 2010 | 20429448 |
| evaluation of the efficacy of an insecticidal paint based on chlorpyrifos and pyriproxyfen in a microencapsulated formulation against rhynchophorus ferrugineus (coleoptera: curculionidae). | the weevil rhynchophorus ferrugineus (olivier) (coleoptera: curculionidae) is an important pest of palms. it has recently colonized the mediterranean basin where it is a serious problem on ornamental phoenix canariensis (hort. ex chabaud) palms. the efficacy of an insecticidal paint based on chlorpyrifos and pyriproxyfen in a microencapsulated formulation (inesfly igr fito, industrias químicas inesba s.l., paiporta, spain) against this weevil has been studied. laboratory results proved that pyri ... | 2010 | 20429455 |
| contributions of demography and dispersal parameters to the spatial spread of a stage-structured insect invasion. | stage-structured models that integrate demography and dispersal can be used to identify points in the life cycle with large effects on rates of population spatial spread, information that is vital in the development of containment strategies for invasive species. current challenges in the application of these tools include: (1) accounting for large uncertainty in model parameters, which may violate assumptions of "local" perturbation metrics such as sensitivities and elasticities, and (2) foreca ... | 2010 | 20437952 |
| histone and ribosomal rna repetitive gene clusters of the boll weevil are linked in a tandem array. | histones are the major protein component of chromatin structure. the histone family is made up of a quintet of proteins, four core histones (h2a, h2b, h3 & h4) and the linker histones (h1). spacers are found between the coding regions. among insects this quintet of genes is usually clustered and the clusters are tandemly repeated. ribosomal dna contains a cluster of the rrna sequences 18s, 5.8s and 28s. the rrna genes are separated by the spacers its1, its2 and igs. this cluster is also tandemly ... | 2010 | 20456508 |
| (1r,2s,6r)-2-hydroxymethyl-2,6-dimethyl-3-oxabicyclo[4.2.0]octane, a new volatile released by males of the papaya borer pseudopiazurus obesus (col.: curculionidae). | sex-specific volatiles produced by males of the papaya beetle pseudopiazurus obesus are (1r,2s)-grandisal (1), (1r,2s)-grandisol (2), and the new (1r,2s,6r)-2-hydroxymethyl-2,6-dimethyl-3-oxabicyclo[4.2.0]octane (3) termed papayanol. | 2010 | 20465270 |
| host-associated genetic differentiation in a seed parasitic weevil rhinusa antirrhini (coleptera: curculionidae) revealed by mitochondrial and nuclear sequence data. | plant feeding insects and the plants they feed upon represent an ecological association that is thought to be a key factor for the diversification of many plant feeding insects, through differential adaptation to different plant selective pressures. while a number of studies have investigated diversification of plant feeding insects above the species level, relatively less attention has been given to patterns of diversification within species, particularly those that also require plants for ovip ... | 2010 | 20465586 |
| altered cysteine proteinase activity in insecticide-resistant strains of the maize weevil: purification and characterization. | insecticide resistance is usually associated with fitness costs, but such costs may be mitigated by increased energy and amino acid accumulation and mobilization as has been suggested in the maize weevil sitophilus zeamais (coleoptera: curculionidae). to address this adaptation, cysteine proteinases (e.c. 3.4.22), one of the main proteinases in weevils, was purified from an insecticide-susceptible and two insecticide-resistant strains of the maize weevil (one with fitness costs, referred as resi ... | 2010 | 20546912 |
| nitrogen concentration in mountain pine beetle larvae reflects nitrogen status of the tree host and two fungal associates. | individual lodgepole pines (pinus contorta) were fertilized with urea at nitrogen (n) inputs equivalent to 0, 315, or 630 kg/ha. four months after application of the fertilizer, inner bark tissue n concentrations were significantly higher in the trees that had received the low dose (315 kg/ha) fertilization treatment than in the control trees; trees that had received the high-dose treatment (630 kg/ha) were intermediate and not significantly different from either of the other treatments. there w ... | 2010 | 20550794 |
| seeing the forest through the trees: differential dispersal of hylobius warreni within modified forest habitats. | hylobius warreni wood, also known as the warren root collar weevil, is a flightless insect that feeds on conifers throughout the boreal forests of canada. mature trees typically can withstand feeding, but larval feeding around the root collar may cause mortality to young trees. recently, a large outbreak of mountain pine beetle (dendroctonus ponderosae hopkins) has killed a high proportion of mature lodgepole pine (pinus contorta douglas variety latifolia) across british columbia, canada. this r ... | 2010 | 20550804 |
| effect of temperature on the population growth of rhynchophorus ferrugineus (coleoptera: curculionidae) on sugarcane. | the effect of temperature on the developmental time, survival, and reproduction of rhynchophorus ferrugineus (olivier) reared on sugarcane was studied at seven constant temperatures (16, 20, 24, 28, 32, 36, and 40 degrees c). the developmental threshold temperatures and effective accumulated temperatures for the whole generation were 17.41 degrees c and 1,590.72 dd, respectively. one generation had the highest survival rate (26.67%) at 28 degrees c. the egg failed to survive at 16 and 40 degrees ... | 2010 | 20550815 |
| influence of tillage on adult and immature pea leaf weevil (coleoptera: curculionidae) densities in pea. | the pea leaf weevil, sitona lineatus (l.) (coleoptera: curculionidae), has been a major pest of pea, pisum sativum l., in eastern washington and northern idaho since its introduction to the region in the early 1970s. eggs are deposited in the spring on the soil surface and first instars hatch and move to pea root nodules, where larvae feed before they pupate and adults emerge in mid- to late summer. no-tillage practices are known to reduce pea leaf weevil colonization in pea, but the effects of ... | 2010 | 20568614 |
| field evaluation of traps and lures for monitoring plum curculio (coleoptera: curculionidae) in alabama peaches. | the plum curculio, conotrachelus nenuphar (herbst) (coleoptera: curculionidae), is a key pest of peaches, prunus persica (l.) batsch, in north america. we evaluated the effectiveness of two widely used trap types (pyramid versus circle traps) and commercially available synthetic lures for monitoring the pest in two peach orchards in alabama during 2008 and 2009. the lures evaluated alone or in combinations included benzaldehyde (bz) (a component of fruit odor), plum essence (pe) (a mixture of fr ... | 2010 | 20568620 |
| molecular identification of larval stages of otiorhynchus (coleoptera: curculionidae) species based on polymerase chain reaction-restriction fragment length polymorphism analysis. | a couple of different members of the coleopteran genus otiorhynchus (coleoptera: curculionidae) are becoming increasingly important as pests of nursery and ornamental plants in global horticulture. although adult weevils are morphologically distinguishable by skilled personnel, high potential for misidentification is given for cryptic larval stages. for developing and applying efficient pest management strategies the determination of the respective species is however a prerequisite, because each ... | 2010 | 20568637 |
| mortality of four stored product pests in stored wheat when exposed to doses of three entomopathogenic nematodes. | the insecticidal effect of heterorhabditis bacteriophora poinar (nematoda: heterorhabditidae), steinernema carpocapsae (weiser) (nematoda: steinernematidae), and steinernema feltiae (filipjev) (nematoda: steinernematidae) against mediterranean flour moth, ephestia kuehniella (zeller) (lepidoptera: pyralidae) (larvae), lesser grain borer, rhyzopertha dominica (f.) (coleoptera: bostrychidae) (adults), rice weevil, sitophilus oryzae (l.) (coleoptera: curculionidae) (adults), and confused flour beet ... | 2010 | 20568646 |
| wolbachia infection in the tribe naupactini (coleoptera, curculionidae): association between thelytokous parthenogenesis and infection status. | several parthenogenetic species of broad-nosed weevils exist, some of them of economic importance because of their pest status. screening of the maternally inherited wolbachia bacterium in 29 weevils of the tribe naupactini, using multilocus sequence typing allowed us to assess a significant correlation between asexuality and infection, and suggests an involvement of wolbachia in the origin of this reproductive mode. the nine wolbachia strains retrieved from the naupactini belong to the b superg ... | 2010 | 20597993 |
| immunocompetence of the red turpentine beetle, dendroctonus valens leconte (coleoptera: curculionidae, scolytinae): variation between developmental stages and sexes in populations in china. | immune defense imposes fitness costs as well as benefits, so organisms should optimize, not maximize, their immune function through their life cycle. we investigated this issue in the red turpentine beetle, dendroctonus valens leconte (coleoptera: curculionidae, scolytinae), which is a pine-killing invasive beetle in china, though it is usually considered as a secondary pest in its native range of north america. we hypothesized that pathogen pressure may affect these beetles differently througho ... | 2010 | 20615412 |
| isolation and characterization of microsatellite loci in the fruit tree weevil naupactus xanthographus (coleoptera: curculionidae): cross-amplification in related species of the naupactus-pantomorus complex. | | 2010 | 20625210 |
| antennal morphology and sensilla ultrastructure of dendroctonus valens leconte (coleoptera: curculionidae, seolytinae), an invasive forest pest in china. | dendroctonus valens leconte, an invasive forest pest, is highly dependent on its olfactory system for activities such as host seeking, mating, oviposition and population aggregation. the antennae are the primary olfactory organs in bark beetles. we describe four morphological types of sensilla on the antenna of d. valens: (1) 3 subtypes of sensilla trichodea located at the apex and lateral surface of the club. sensilla trichodea types 1 and 3 were innervated by 5 and 13 dendrites, respectively. ... | 2010 | 20643555 |
| two new ophiostoma species from protea caffra in zambia. | the genus ophiostoma (ophiostomatales) has a global distribution and species are best known for their association with bark beetles (curculionidae: scolytinae) on conifers. an unusual assemblage of these fungi is closely associated with the african endemic plant genus protea (proteaceae). protea-associated ophiostoma species are ecologically atypical as they colonise the fruiting structures of various serotinous protea species. seven species have been described from this niche in south africa. i ... | 2010 | 20664757 |
| molecular and biochemical characterisation of a dual proteolytic system in vine weevil larvae (otiorhynchus sulcatus coleoptera: curculionidae). | the ability of phytophagous insects to utilise the relatively low nitrogen content of plant tissues is typically the limiting factor in their nutritional uptake. in the larval stage, the vine weevil feeds predominantly on root tissues of plants. the root tissue as a whole has low levels of free amino acids, and thus effective hydrolysis of dietary proteins is essential for survival. in contrast to previous reports the present study demonstrates through both molecular and biochemical studies the ... | 2010 | 20709171 |
| utilisation of priority traditional medicinal plants and local people's knowledge on their conservation status in arid lands of kenya (mwingi district). | mwingi district lies within the kenyan arid and semiarid lands (asals) in eastern province. although some ethnobotanical surveys have been undertaken in some arid and semiarid areas of kenya, limited studies have documented priority medicinal plants as well as local people's awareness of conservation needs of these plants. this study sought to establish the priority traditional medicinal plants used for human, livestock healthcare, and those used for protecting stored grains against pest infesta ... | 2010 | 20712897 |
| sexual selection: the weevils of inbreeding. | a recent study has used inbreeding depression to gain insight into the maintenance of additive genetic variation in populations, with intriguing implications for good genes models of sexual selection. | 2010 | 20728051 |
| the neogregarine protozoan farinocystis sp. reduces longevity and fecundity in the west indian sweet potato weevil, euscepes postfasciatus (fairmaire). | the number of west indian sweet potato weevils, euscepes postfasciatus, being mass-reared in a facility for use in sterile insect technique (sit) eradication programs has undergone a drastic reduction. a neogregarine protozoan pathogen farinocystis sp. (an undescribed species) was detected in vivo in the mass-reared e. postfasciatus. we investigated the effects of this disease on the longevity and fecundity of host weevils and the incubation time of the disease in the host body under mass-rearin ... | 2010 | 20736016 |
| antennal sensilla of the pine weevil pissodes nitidus roel. (coleoptera: curculionidae). | the antennal sensilla of the pine weevil (pissodes nitidus roel.) were observed with scanning electron microscopy and transmission electron microscopy (tem). the weevil antenna consists of a long scape, a pedicel, and a flagellum with 10 segments; the last four flagellum segments are fused, forming the antennal club, which is densely covered by various sensilla. in both sexes, six types of sensilla, sensilla palmate 1-4, sensilla chaetica, sensilla trichoid, sensilla basiconic 1-2, sensilla rod- ... | 2011 | 20812250 |
| basic bio-ecological parameters of the invasive red palm weevil, rhynchophorus ferrugineus (coleoptera: curculionidae), in phoenix canariensis under mediterranean climate. | the invasive red palm weevil, rhynchophorus ferrugineus olivier (coleoptera, curculionidae), is one of the most destructive pests of palms in the world. since its detection in the mediterranean basin, the ornamental phoenix canariensis hort. ex chabaud has become its main host. this study was aimed at determining the life cycle of r. ferrugineus in live p. canariensis palms. egg lethal temperature threshold and thermal constant were determined in the laboratory and resulted in 13.1°c and 40.4 de ... | 2011 | 20822555 |
| a model for long-distance dispersal of boll weevils (coleoptera: curculionidae). | the boll weevil, anthonomus grandis (boheman), has been a major insect pest of cotton production in the us, accounting for yield losses and control costs on the order of several billion us dollars since the introduction of the pest in 1892. boll weevil eradication programs have eliminated reproducing populations in nearly 94%, and progressed toward eradication within the remaining 6%, of cotton production areas. however, the ability of weevils to disperse and reinfest eradicated zones threatens ... | 2010 | 20835731 |
| trait-mediated interactions and lifetime fitness of the invasive plant centaurea solstitialis. | plants interact with numerous enemies and mutualists simultaneously and sequentially. such multispecies interactions can give rise to trait-mediated indirect effects that are likely to be common in nature but which are also inherently difficult to predict. understanding multispecies interactions is also important in the use of biological control agents to control invasive plants because modern approaches to biocontrol rely on releasing multiple agents for each target weed. centaurea solstitialis ... | 2010 | 20836450 |
| effect of mass rearing on life history traits and inbreeding depression in the sweetpotato weevil (coleoptera: brentidae). | inadvertent selection is an important genetic process that frequently occurs during laboratory culture and maintenance of biological control agents and other beneficial organisms used in procedures such as the sterile insect technique (sit). we investigated effects of mass rearing and inbreeding depression on life history traits (number of progeny emerging from host plants, body weight, developmental period, and starvation tolerance) in the sweetpotato weevil, cylas formicarius elegantulus (summ ... | 2010 | 20857721 |
| temperature-dependent development and emergence pattern of hypothenemus hampei (coleoptera: curculionidae: scolytinae) from coffee berries. | the coffee berry borer, hypothenemus hampei (ferrari) (coleoptera: curculionidae: scolytinae), is the most important constrain for coffee production throughout the world. knowledge on the emergence pattern of h. hampei females to infest new berries is crucial to effectively plan control measures. in this laboratory study, we assessed the development of immature stages and the emergence pattern of h. hampei females from the berries by exposing them to temperatures that are typical for high-altitu ... | 2010 | 20857723 |
| species composition, seasonal activity, and semiochemical response of native and exotic bark and ambrosia beetles (coleoptera: curculionidae: scolytinae) in northeastern ohio. | in 2007, we surveyed the alien and endemic scolytine (bark and ambrosia beetles) fauna of northeastern ohio, and for the most abundant species, we characterized their seasonal activity and response to three semiochemical baits. in total ,5,339 scolytine beetles represented by 47 species and 29 genera were caught in lindgren funnel traps. three species constituted 57% of the total catch, including xylosandrus germanus (blandford), tomicus piniperda (l.), and dryocoetes autographus (ratzeburg). of ... | 2010 | 20857727 |
| plum curculio (coleoptera: curculionidae) adult mortality and associated fruit injury after exposure to field-aged insecticides on tart cherry branches. | plum curculio, conotrachelus nenuphar (herbst) (coleoptera: curculionidae), adults were exposed to field-aged residues of thiamethoxam, acetamiprid, thiacloprid, indoxacarb, or azinphos-methyl on tart cherry, prunus cerasus l. variety montmorency. at 1, 3, 7, and 14 d postapplication, fruit were sampled for chemical residues, and bioassays were used to assess beetle mortality and plant tissue injury. azinphos-methyl had lethal activity within 1 d of exposure at all postapplication intervals and ... | 2010 | 20857728 |
| dna identification confirms pecan weevil (coleoptera: curculionidae) infestation of carpathian walnut. | larvae found infesting fruit from a carpathian walnut, juglans regia l., tree in missouri were confirmed by dna analysis to be those of pecan weevil, curculio caryae (horn) (coleoptera: curculionidae). the infested walnut tree occurs in the midst of pecan weevil-infested pecans, carya illinoinensis (wang.) k. koch; the larval haplotypes were found to be identical to pecan weevil larvae from the region, indicating that the walnut infestation arose by association with infested pecan. this is the f ... | 2010 | 20857742 |
| toxicity of seven bacillus thuringiensis cry proteins against cylas puncticollis and cylas brunneus (coleoptera: brentidae) using a novel artificial diet. | "sweetpotato weevils" cylas puncticollis (boheman) and cylas brunneus f. (coleoptera: brentidae) are the most important biological threat to sweetpotato, ipomoea batatas l. (lam), productivity in sub-saharan africa. sweetpotato weevil control is difficult due to their cryptic feeding behavior. expression of cylas-active bacillus thuringiensis (bt) cry proteins in sweetpotato could provide an effective control strategy. unfortunately, bt cry proteins with relatively high toxicity against cylas sp ... | 2010 | 20857765 |
| early-season headspace volatiles from apple and their effect on the apple blossom weevil anthonomus pomorum. | apple volatiles emitted at early phenological stages are little investigated, although they may influence behavior of early-season pests. the apple blossom weevil anthonomus pomorum is a herbivore pest of orchards in europe. it colonizes apple trees in early season and oviposits into developing flower buds, often leading to economic damage. using in situ radial diffusive sampling and thermal desorption, followed by gc/ms analysis, headspace volatiles from apple twigs with flower buds at three ea ... | 2010 | 20860027 |
| insecticidal and repellency activity of essential oil of eucalyptus sp. against sitophilus zeamais motschulsky (coleoptera, curculionidae). | the objective of this work was to evaluate the insecticidal and repellent effect of essential oils of eucalyptus dunnii, e. saligna, e. benthamii, e. globulus and e. viminalis in the control of sitophilus zeamais in maize grains. | 2011 | 20945512 |
| biological role of nardonella endosymbiont in its weevil host. | weevils constitute the most species-rich animal group with over 60,000 described species, many of which possess specialized symbiotic organs and harbor bacterial endosymbionts. among the diverse microbial associates of weevils, nardonella spp. represent the most ancient and widespread endosymbiont lineage, having co-speciated with the host weevils for over 125 million years. thus far, however, no empirical work on the role of nardonella for weevil biology has been reported. here we investigated ... | 2010 | 20957033 |
| developing a systems approach for sternochetus mangiferae (coleoptera: curculionidae) in south africa. | sternochetus mangiferae (f.) (coleoptera: curculionidae) is a quarantine pest of mango, mangifera indica l., in south africa. the aim of the study was to test cultural and chemical control measures in a systems approach for risk mitigation of s. mangiferae in south africa. a large-scale experiment, using a randomized block design with three replicates, was undertaken on 'tommy atkins' mangoes in south africa. five treatment combinations were applied over two seasons: (1) untreated control; (2) s ... | 2010 | 21061956 |
| acoustic indicators for targeted detection of stored product and urban insect pests by inexpensive infrared, acoustic, and vibrational detection of movement. | crawling and scraping activity of three stored-product pests, sitophilus oryzae (l.) (coleoptera: curculionidae), tribolium castaneum (herbst) (coleoptera: tenebrionidae), and stegobium paniceum (l.) (coleoptera: anobiidae), and two urban pests, blattella germanica (l.) (blattodea: blattellidae) and cimex lectularius l. (hemiptera: cimicidae), were monitored individually by infrared sensors, microphones, and a piezoelectric sensor in a small arena to evaluate effects of insect locomotory behavio ... | 2010 | 21061963 |
| incidence of bark- and wood-boring insects in firewood: a survey at michigan's mackinac bridge. | firewood is a major pathway for the inadvertent movement of bark- and wood-infesting insects. after discovery of agrilus planipennis fairmaire (coleoptera: buprestidae) in southeastern michigan in 2002, quarantines were enacted including prohibition of transporting firewood across the mackinac bridge between michigan's lower and upper peninsulas. drivers are required to surrender firewood before crossing the bridge. we surveyed recently surrendered firewood in april, july, and september 2008 and ... | 2010 | 21061968 |
| synergism between demethylation inhibitor fungicides or gibberellin inhibitor plant growth regulators and bifenthrin in a pyrethroid-resistant population of listronotus maculicollis (coleoptera: curculionidae). | in 2007-2008, the "annual bluegrass weevil," listronotus maculicollis kirby (coleoptera: curculionidae), a serious pest of poa annua l. (poales: poaceae) on u.s. golf courses, was shown to be resistant to two pyrethroids, bifenthrin and lambda-cyhalothrin. in 2008, we showed that bifenthrin resistance was principally mediated by oxidase detoxification (cytochrome p450 [p450]). p450s can be inhibited by demethylation inhibitor fungicides and gibberellin inhibitor plant growth regulators, both of ... | 2010 | 21061984 |
| resynthesized lines and cultivars of brassica napus l. provide sources of resistance to the cabbage stem weevil ( ceutorhynchus pallidactylus (mrsh.)). | the cabbage stem weevil (ceutorhynchus pallidactylus (mrsh.)) (col., curculionidae) is a serious pest of winter oilseed rape (brassica napus l. var. oleifera metzg.) in central and northern europe. although host-plant resistance is a key tool in integrated pest management systems, resistant genotypes are not yet available for this species. resynthesized rapeseed lines (b. oleracea l.×b. rapa l.) are broadening the genetic diversity and might have potential as sources of resistance to pest insect ... | 2010 | 21092380 |
| practical and theoretical characterization of inga laurina kunitz inhibitor on the control of homalinotus coriaceus. | digestive endoprotease activities of the coconut palm weevil, homalinotus coriaceus (coleoptera: curculionidae), were characterized based on the ability of gut extracts to hydrolyze specific synthetic substrates, optimal ph, and hydrolysis sensitivity to protease inhibitors. trypsin-like proteinases were major enzymes for h. coriaceus, with minor activity by chymotrypsin proteinases. more importantly, gut proteinases of h. coriaceus were inhibited by trypsin inhibitor from inga laurina seeds. in ... | 2010 | 21094272 |
| niche explosion. | the following syndrome of features occurs in several groups of phytophagous insects: (1) wingless females, (2) dispersal by larvae, (3) woody hosts, (4) extreme polyphagy, (5) high abundance, resulting in status as economic pests, (6) invasiveness, and (7) obligate parthenogenesis in some populations. if extreme polyphagy is defined as feeding on 20 or more families of hostplants, this syndrome is found convergently in several species of bagworm moths, tussock moths, root weevils, and 5 families ... | 2010 | 21104426 |
| cloning and expression analysis of a g-protein α subunit--gαo in the rice water weevil lissorhoptrus oryzophilus kuschel. | the open reading frame (orf) encoding a novel g protein α subunit, lo gα(o), was cloned from the parthenogenetic rice water weevil, lissorhoptrus oryzophilus kuschel (coleoptera: curculionidae). the lo gα(o) orf encodes a protein of 354 amino acid residues. the deduced protein sequence shares high homology with gα(o) from other species. the expression patterns of lo gα(o) in various adult tissues were indicated by real-time quantitative pcr and western blot. the results showed that lo gα(o) mrna ... | 2011 | 21125564 |
| hemocytes of rhynchophorus ferrugineus (olivier) (coleoptera: curculionidae) and their response to saccharomyces cerevisiae and bacillus thuringiensis. | originally from tropical asia, the red palm weevil (rpw rhynchophorus ferrugineus (olivier)) is the most dangerous and deadly pest of many palm trees, and there have been reports of its recent detection in france, greece and italy. at present, emphasis is on the development of integrated pest management based on biological control rather than on chemical insecticides, however the success of both systems is often insufficient. in this regard, rpw appears to be one pest that is very difficult to c ... | 2010 | 21147119 |
| the effect of inbreeding on defence against multiple enemies in datura stramonium. | the ability of plants to respond to natural enemies might depend on the availability of genetic variation for the optimal phenotypic expression of defence. selfing can affect the distribution of genetic variability of plant fitness, resistance and tolerance to herbivores and pathogens. the hypothesis of inbreeding depression influencing plant defence predicts that inbreeding would reduce resistance and tolerance to damage by natural enemies relative to outcrossing. in a field experiment entailin ... | 2010 | 21159000 |
| otiorhynchus sulcatus, an autopolyploid general-purpose genotype species? | the weevil otiorhynchus sulcatus is a pest species that has spread rapidly to large parts of the world due to human activities. o. sulcatus is extremely polyphagous and found to attack a large number of agricultural and horticultural plant species despite that all individuals are clonal triploid females. i here compare the genetical variation in specimens from various parts of the distribution using both mtdna and nuclear dna. the genetical markers employed indicate o. sulcatus to be an evolutio ... | 2010 | 21166797 |
| argentine stem weevil ( listronotus bonariensis, coleoptera: curculionidae) population dynamics in canterbury, new zealand dryland pasture. | the argentine stem weevil (listronotus bonariensis) was an economically important pest in new zealand pastures until the release of the parasitoid microctonus hyperodae. this contribution uses historical data to investigate the regulation of the pest populations prior to, and somewhat during, the establishment of this parasitoid in dryland canterbury, new zealand. thus, a significant goal of this study is to provide an l. bonariensis population dynamics baseline for any future work that aims to ... | 2010 | 21205396 |
| field evaluation of reduced insecticide spray programs for managing plum curculio, conotrachelus nenuphar (coleoptera: curculionidae), in alabama peaches. | plum curculio (pc), conotrachelus nenuphar (herbst.), is an important pest of peaches in the southeastern united states. commercially acceptable control of this insect is typically achieved by weekly or biweekly application of broad-spectrum conventional insecticides, resulting in 6-12 sprays per season. experiments were conducted in a peach orchard in alabama during 2007-2009 to compare the conventional calendar-based insecticide spray program involving weekly applications of phosmet with three ... | 2011 | 21268230 |
| threat to cedar, cedrela odorata, plantations in vietnam by the weevil, aclees sp. | the recent decline and death of young cedar, cedrela odorata l. (sapindales: meliaceae), plantations in vietnam is caused by aclees sp. (coleoptera: curculionidae), a wood-boring brown weevil. a field study was undertaken in three-year-old plantations in two districts in thanh hoa province in august 2008. trees were heavily impacted by the weevil, aclees; the infestation level (p) ranged from 80 to 100% and the average damage index (r) ranged from 1.8 to 2.8. observations over one year enabled t ... | 2010 | 21271846 |
| genetic variation in avocado stem weevils copturus aguacatae (coleoptera: curculionidae) in mexico. | the avocado stem weevil copturus aguacatae is an important pest in avocado plantations. its presence hinders the production and marketing of avocado in mexico, the largest avocado producer worldwide. biological control through pheromone synthesis, a strategy favored over chemical control in crops, is currently limited by difficult field identification of this species. | 2010 | 21271857 |
| alternative stable states explain unpredictable biological control of salvinia molesta in kakadu. | suppression of the invasive plant salvinia molesta by the salvinia weevil is an iconic example of successful biological control. however, in the billabongs (oxbow lakes) of kakadu national park, australia, control is fitful and incomplete. by fitting a process-based nonlinear model to thirteen-year data sets from four billabongs, here we show that incomplete control can be explained by alternative stable states--one state in which salvinia is suppressed and the other in which salvinia escapes we ... | 2011 | 21293376 |
| phylogenetic relationships among bisexual and unisexual lineages of the weevil scepticus insularis (coleoptera: curculionidae) on hokkaido, northern japan. | we examined the geographic distributions and phylogenetic relationships of bisexual and unisexual (parthenogenetic) forms of the weevil scepticus insularis on hokkaido island, northern japan. unisexual beetles were widespread throughout hokkaido, whereas bisexuals were found only in three remote areas. bisexuals (females and males) and unisexual females occurred sympatrically in two areas. we determined nucleotide sequences for part of the mitochondrial nadh dehydrogenase subunit 2 (nd2; 633 bp) ... | 2011 | 21303200 |
| assessment of effect of partial sterility on mating performance in sweetpotato weevil (coleoptera: curculionidae). | the sterile insect technique (sit) is widely used to suppress or eradicate target pest insect populations. although the effectiveness of sit depends on the ability of released sterile males to mate with and inseminate wild females, the use of gamma radiation to induce sterility negatively impacts reproductive cells as well as somatic cells. consequently, sterilization by irradiation drastically diminishes mating performance over time. in the current study, we evaluated the effect of irradiation ... | 2010 | 21309223 |
| composition and toxic, repellent and feeding deterrent activity of essential oils against the stored-grain pests tribolium castaneum (coleoptera: tenebrionidae) and sitophilus oryzae (coleoptera: curculionidae). | the composition and bioactivity of essential oils from tagetes terniflora kunth, cymbopogon citratus stapf. and elyonurus muticus (spreng) kuntz were evaluated against stored-grain pests. | 2011 | 21365739 |
| antifeedant effect of commercial chemicals and plant extracts against schistocerca americana (orthoptera: acrididae) and diaprepes abbreviatus (coleoptera: curculionidae). | the deterrent effect of seven commercial compounds against schistocerca americana (drury) nymphs and diaprepes abbreviatus l. adults, two important citrus pests, was investigated. extracts of three florida local plants were also tested as deterrents. antifeedant activity was assayed using a leaf-disk bioassay in choice and no-choice tests. the residual activity of the commercial compounds that significantly deterred the insects was assayed by applying them to foliage of citrus plants exposed to ... | 2011 | 21370392 |
| the first record of gregarina typographi fuchs (protista: apicomplexa: gregarinidae) from the european spruce bark beetle, ips typographus (linnaeus) (coleoptera: curculionidae, scolytinae) in turkey. | objective: aim of this study is determining pathogens of ips typographus from eastern black sea region in turkey. methods: samples collected from the field were taken to laboratuar as soon as possible. microscopic examination was completed by dissection with ringer's solution. results: 780 ips typographus beetles from giresun, rize and artvin were examined. gregarines were observed in the populations of i. typographus in the three regions. 27 of 780 beetles were found to be infected by the grega ... | 2010 | 21391188 |
| effects of combining microbial and chemical insecticides on mortality of the pecan weevil (coleoptera: curculionidae). | the pecan weevil, curculio caryae (horn), is a key pest of pecan [carya illinoinensis (wangenh.) k. koch]. current control recommendations are based on chemical insecticide applications. microbial control agents such as the entomopathogenic nematode, steinernema carpocapsae (weiser) and the fungus beauveria bassiana (balsamo) vuillemin occur naturally in southeastern u.s. pecan orchards and have shown promise as alternative control agents for c. caryjae. conceivably, the chemical and microbial a ... | 2011 | 21404833 |
| increasing coffee berry borer (coleoptera: curculionidae: scolytinae) female density in artificial diet decreases fecundity. | three experiments were conducted to determine the influence of number of coffee berry borer, hypothenemus hampei (ferrari) (coleoptera: curculionidae: scolytinae), females (one, two, or five) reared in artificial diet on fecundity and subsequent development of larvae, pupae, and adults. our results demonstrated that increasing female density from one to two or five individuals did not result in the expected two- or five-fold increase in progeny, despite ample food resources available. instead, d ... | 2011 | 21404844 |
| the age and phylogeny of wood boring weevils and the origin of subsociality. | a large proportion of the hyperdiverse weevils are wood boring and many of these taxa have subsocial family structures. the origin and relationship between certain wood boring weevil taxa has been problematic to solve and hypotheses on their phylogenies change substantially between different studies. we aimed at testing the phylogenetic position and monophyly of the most prominent wood boring taxa scolytinae, platypodinae and cossoninae, including a range of weevil outgroups with either the herb ... | 2011 | 21435394 |
| plant vigor hypothesis refuted: preference-performance linkage of a gall-inducing weevil on small-sized host plant resources. | the plant vigor hypothesis (pvh) predicts an oviposition preference of females and higher offspring performance for insect herbivores on longer and fast-growing plant modules. we tested the pvh predictions by investigating the effects of leaf size of miconia prasina (sw.) dc. (melastomataceae) on the oviposition preference and on the offspring survival of the gall-inducing weevil prospoliata bicolorata (coleoptera: curculionidae). additionally, we analysed the effects of top-down mortality force ... | 2011 | 21437400 |
| identification and field evaluation of attractants for the cranberry weevil, anthonomus musculus say. | studies were conducted to develop an attractant for the cranberry weevil, anthonomus musculus, a pest of blueberry and cranberry flower buds and flowers in the northeastern united states. in previous studies, we showed that cinnamyl alcohol, the most abundant blueberry floral volatile, and the green leaf volatiles (z)-3-hexenyl acetate and hexyl acetate, emitted from both flowers and flower buds, elicit strong antennal responses from a. musculus. here, we found that cinnamyl alcohol did not incr ... | 2011 | 21445566 |
| biochemical characterisation of a-amylase inhibitors from achyranthes aspera and their interactions with digestive amylases of coleopteran and lepidopteran insects. | starchy seeds are an important food and a source of dietary ingredients in many countries. however, they suffer from extensive predation by bruchids (weevils) and other pests. a-amylase inhibitors are attractive candidates for the control of seed weevils, as these insects are highly dependent on starch as an energy source. | 2011 | 21445897 |
| laboratory assays of select candidate insecticides for control of dendroctonus ponderosae. | the mountain pine beetle, dendroctonus ponderosae hopkins (coleoptera: curculionidae, scolytinae), is the most destructive bark beetle in western north america. dendroctonus ponderosae can be prevented from successfully colonizing and killing individual trees by ground-based sprays of insecticides applied directly to the tree bole. however, the future availability of several active ingredients, including carbaryl which is most commonly used in the western united states, is uncertain. two novel i ... | 2011 | 21472972 |
| successful development of microsatellite markers in a challenging species: the horizontal borer austroplatypus incompertus (coleoptera: curculionidae). | the analysis of microsatellite loci has allowed significant advances in evolutionary biology and pest management. however, until very recently, the potential benefits have been compromised by the high costs of developing these neutral markers. high-throughput sequencing provides a solution to this problem. we describe the development of 13 microsatellite markers for the eusocial ambrosia beetle, austroplatypus incompertus, a significant pest of forests in southeast australia. the frequency of mi ... | 2011 | 21477421 |
| a new light on the evolution and propagation of prehistoric grain pests: the world's oldest maize weevils found in jomon potteries, japan. | three sitophilus species (s. granarius l., s. oryzae l., and s. zeamais mots.) are closely related based on dna analysis of their endosymbionts. all are seed parasites of cereal crops and important economic pest species in stored grain. the sitophilus species that currently exist, including these three species, are generally believed to be endemic to asia's forested areas, suggesting that the first infestations of stored grain must have taken place near the forested mountains of southwestern asi ... | 2011 | 21479261 |
| components and insecticidal activity against the maize weevils of zanthoxylum schinifolium fruits and leaves. | in our screening program for new agrochemicals from chinese medicinal herbs and wild plants, zanthoxylum schinifolium essential oils were found to possess strong insecticidal activity against the maize weevil sitophilus zeamais. the essential oils of z. schinifolium fruits and leaves were extracted via hydrodistillation and investigated by gc and gc-ms. estragole (69.52%) was the major compound of the essential oil of fresh fruits, followed by linalool (8.63%) and limonene (4.34%) and 94.33% of ... | 2011 | 21490556 |
| pyrethroid resistance in sitophilus zeamais is associated with a mutation (t929i) in the voltage-gated sodium channel. | the maize weevil, sitophilus zeamais, is the most important pest affecting stored grain in brazil and its control relies heavily on the use of insecticides. the intensive use of compounds such as the pyrethroids has led to the emergence of resistance, and previous studies have suggested that resistance to both pyrethroids and 1,1,1-trichloro-2,2-bis(p-chlorophenyl)ethane (ddt) may result from reduced sensitivity of the insecticide target, the voltage-gated sodium channel. to identify the molecul ... | 2011 | 21496128 |
| climatic gradients of arms race coevolution. | in nature, spatiotemporally dynamic coevolutionary processes play major roles in the foundation and maintenance of biodiversity. here, we examined the arms race coevolution involving a seed-eating weevil with a long snout and its camellia plant host with a thick fruit coat (pericarp) throughout the marked climatic gradient observed across the japanese islands. results demonstrated that female weevils, which bored holes through camellia pericarps to lay eggs into seeds, had evolved much longer sn ... | 2011 | 21508604 |
| heated-controlled atmosphere postharvest treatments for macchiademus diplopterus (hemiptera: lygaeidae) and phlyctinus callosus (coleoptera: curculionidae). | nonchemical, environmentally friendly quarantine treatments are preferred for use in postharvest control of insect pests. combined high temperature and controlled atmosphere quarantine treatments for phytosanitary fruit pests macchiademus diplopterus (distant) (hemiptera: lygaeidae) and phlyctinus callosus (schoenherr) (coleoptera: curculionidae) were investigated to determine the potential of such treatments for quarantine security. field-collected, aestivating m. diplopterus adults and p. call ... | 2011 | 21510185 |