Publications
| Title | Abstract | Year Filter | PMID(sorted ascending) Filter |
|---|
| lethal and sublethal effects of rice polishing process on sitophilus oryzae (coleoptera: curculionidae). | the mechanical impact of rice polishingon the rice weevil, sitophilus oryzae (l.), and the subsequent postpolishing effects associated with rice quality were studied. "brown" rice (not polished), "white (infest then polish)" rice, and "white (polish then infest)" rice were used with different polishing process intensities and different initial weevil densities. weevil progeny were more numerous in brown than in white (infest then polish) or white (polish then infest) rice. polishing correspondin ... | 2000 | 11142320 |
| virulence of entomopathogenic nematodes to pecan weevil larvae, curculio caryae (coleoptera: curculionidae), in the laboratory. | the pecan weevil, curculio caryae (horn), is a key pest of pecans in the southeast. entomopathogenic nematodes have been shown to be pathogenic toward the larval stage of this pest. before this research, only three species of nematodes had been tested against pecan weevil larvae. in this study, the virulence of the following nine species and 15 strains of nematodes toward fourth-instar pecan weevil was tested: heterorhabditis bacteriophora poinar (baine, hp88, oswego, nj1, and tf strains), h. in ... | 2001 | 11233136 |
| emergence trap developed to capture adult large pine weevil hylobius abietis (coleoptera: curculionidae) and its parasite bracon hylobii (hymenoptera: braconidae). | a novel type of emergence trap capable of capturing and separating 'live' insect catches is described. the trap was shown to be 96% efficient at capturing newly emergent adult hylobius abietis linnaeus on bare ground and at least 82% efficient over stumps on a weedy sitka spruce clearfell. the trap was more than 80% efficient at capturing bracon hylobii ratzeburg, the most commonly found parasite of h. abietis. it was also shown to be effective at capturing adult h. abietis of unknown age (98%), ... | 2001 | 11260725 |
| dependence of sitona lepidus (coleoptera: curculionidae) larvae on abundance of white clover rhizobium nodules. | 2001 | 11260730 | |
| changes in volatile terpene and diterpene resin acid composition of resistant and susceptible white spruce leaders exposed to simulated white pine weevil damage. | induced (traumatic) resin in white spruce (picea glauca (moench) voss) leaders resistant or susceptible to the white pine weevil (pissodes strobi peck) was analyzed for volatile terpenes and diterpene resin acids after simulated white pine weevil damage. leaders from 331 trees were wounded just below the apical bud with a 1-mm diameter drill, coinciding with the natural time of weevil oviposition in the spring. leaders were removed in the fall, and the bark and xylem from the upper and lower reg ... | 2000 | 11269960 |
| karyological investigations on seven weevil species (coleoptera, curculionidae). | karyological studies were carried out on seven palaearctic weevils. the following chromosome numbers were found in individual species, i.e. otiorhynchus niger (f.), phyllobius viridearis (laich.), phyllobius scutellaris redt., phyllobius calcaratus (f.), polydrusus cervinus (l.), and brachyderes incanus (l.) 2n = 22, n male = 10 + xyp, in lixus elegantulus (boh.) 2n = 22, n male = 21 + xyp. the heterochromosomes of all the examined species form, in the first meiotic metaphase, a typical parachut ... | 2000 | 11291535 |
| effects of neem seed derivatives on behavioral and physiological responses of the cosmopolites sordidus (coleoptera: curculionidae). | both in a choice and multi-choice laboratory tests, fewer adults of the banana root borer, cosmopolites sordidus (germar), settled under the corms of the susceptible banana "nakyetengu" treated with 5% aqueous extract of neem seed powder or cake or 2.5 and 5% emulsified neem oil than on water-treated corms. feeding damage by larvae on banana pseudostem discs treated with 5% extract of powdered neem seed, kernel, or cake, or 5% emulsified neem oil was significantly less than on untreated discs. t ... | 2001 | 11332838 |
| the effects of an entomopathogenic fungus, beauveria bassiana (balsamo) vuillemin (hyphomycetes), on prostephanus truncatus (horn) (col.: bostrichidae), sitophilus zeamais motschulsky (col.: curculionidae), and grain losses in stored maize in the benin republic. | a fungal entomopathogen, beauveria bassiana, was used to treat maize ears placed in traditional grain stores against prostephanus truncatus in a field experiment conducted from september 1997 to march 1998 in the benin republic, west africa. treatments included oil-based spray with and without conidia, maize stored with and without the husk, and stores with and without artificial infestation. additional treated ears kept in insect-proof cages under field conditions were sampled weekly and expose ... | 2001 | 11356055 |
| fumigant toxicity of volatile natural products from korean spices and medicinal plants towards the rice weevil, sitophilus oryzae (l). | the fumigant toxicity of various volatile constituents of essential oils extracted from sixteen korean spices and medicinal plants towards the rice weevil, sitophilus oryzae l (coleoptera: curculionidae), was determined. the most potent toxicity was found in the essential oil from mentha arvensis l. var piperascens (lc50 = 45.5 microliters litre-1 air). gc-ms analysis of essential oil from m arvensis showed it to be rich in menthol (63.2%), menthone (13.1%) and limonene (1.5%), followed in abund ... | 2001 | 11407032 |
| tracking colonization and diversification of insect lineages on islands: mitochondrial dna phylogeography of tarphius canariensis (coleoptera: colydiidae) on the canary islands. | the genus tarphius erichson (coleoptera: colydiidae) is represented by 29 species on the canary islands. the majority are rare, single-island endemics intimately associated with the monteverde (laurel forest and fayal-brezal). the tarphius canariensis complex is by far the most abundant and geographically wide-spread, occurring on gran canaria, tenerife and la palma. eighty-seven individuals from the t. canariensis complex were sequenced for 444 bp of the mitochondrial dna cytochrome oxidase i g ... | 2000 | 11413633 |
| the role of spatial scale and intraspecific variation in secondary chemistry in host-plant location by ceutorhynchus assimilis (coleoptera: curculionidae). | to understand the ecological role of secondary plant compounds in host location by phytophagous insects it is important to consider attraction at different scales in natural populations. the cabbage seed weevil, ceutorhynchus assimilis, which lays eggs in pods of crucifers where the larvae feed on seed, is attracted to purified extracts of specific glucosinolate-derived volatiles. we considered the possibility that c. assimilis adults are attracted to and preferentially attack patches of plants ... | 2001 | 11487403 |
| components of male aggregation pheromone of strawberry blossom weevil, anthonomus rubi herbst. (coleoptera:curculionidae). | the strawberry blossom weevil, anthonomus rubi, is a major pest of strawberries in the united kingdom and continental europe. as part of a project to develop noninsecticidal control methods, the pheromone system of this species was investigated. comparison of volatiles produced by field-collected, overwintering individuals of each sex led to identification of three male-specific compounds--(z)-2-(3,3-dimethylcyclohexylidene)ethanol, (cis)-1-methyl-2-(1-methylethenyl)cyclobutaneethanol, and 2-(1- ... | 2001 | 11504023 |
| hypersensitive response of beans to apion godmani (coleoptera: curculionidae). | high levels of resistance to apion godinani wagner have been reported in bean, phaseolus vulgaris l., landraces from mexico. we report on the role of hypersensitivity to a. godmani in five resistant and three susceptible bean genotypes. in susceptible genotypes (cultivars 'canario 107','jamapa', and 'zacatecas 45'), the eggs and first instars of a. godmani were embedded in the pod mesocarp and usually were surrounded by healthy tissue. in contrast, in resistant landraces ('amarillo 154', 'amaril ... | 2001 | 11561858 |
| identification of rice cultivars resistant to lissorhoptrus oryzophilus (coleoptera: curculionidae), and their use in an integrated management program. | the rice water weevil, lissorhoptrus oryzophilus kuschel, is the most destructive insect pest of rice in the united states and is a particularly severe pest in louisiana. the current management program for this insect in louisiana relies heavily on insecticides, most notably the seed treatment fipronil (icon). diversification of the management program by incorporation of alternative strategies is needed to improve the effectiveness and long-term stability of the program. in the three experiments ... | 2001 | 11561859 |
| factors affecting parasitism by microctonus aethiopoides (hymenoptera: braconidae) and parasitoid development in natural and novel host species. | a laboratory study of aspects of parasitoid host acceptance, suitability and physiological regulation in natural and novel host species was carried out to investigate the degree of variability encountered with different hosts and to determine the value of such observations in host range determination. the parasitoid microctonus aethiopoides loan was exposed to a natural host, sitona discoideus gyllenhal (coleoptera: curculionidae) and three novel hosts, the new zealand native nicaeana cervina br ... | 2001 | 11567586 |
| trap type, chirality of alpha-pinene, and geographic region affect sampling efficiency of root and lower stem insects in pine. | root and lower stem insects cause significant damage to conifers, vector phytopathogenic fungi, and can predispose trees to bark beetle attacks. the development of effective sampling techniques is an important component in managing these cryptic insects. we tested the effects of trap type and stereochemistry of alpha-pinene, in combination with ethanol, on catches of the root colonizing weevils (coleoptera: curculionidae) hylobius spp. [mostly hylobius pales (herbst)], and pachylobius picivorus ... | 2001 | 11681673 |
| effect of nitrogen on resistance of sweet potato to sweetpotato weevil (coleoptera: curculionidae) and on storage root chemistry. | the effects of nitrogen fertilizer on sweet potato, ipomoea batatas (l.) poir., resistance to the sweetpotato weevil, cylas formicarius elegantulus (summers), was studied. adult weevil feeding and oviposition preference, larval survival, and pupal weight were used as measures of sweet potato resistance. sweet potato resin glycosides and caffeic acid concentrations in the periderm tissue of storage roots also were measured. sweet potato genotypes (beauregard, excel, w-244, w-250, and sumor) with ... | 2001 | 11681695 |
| anoxia tolerance and anaerobic metabolism in two tropical weevil species (coleoptera, curculionidae). | although the two curculionid beetle species cosmopolites sordidus and temnoschoita nigroplagiata are found in the same habitat (banana plantation), they differ with respect to their microhabitat preference and thereby in their risk of being submerged after rain. the physiological characteristics of the two species that might be important in this context were investigated. as expected, c. sordidus is more resistant to submergence (faster recovery, lower mortality: 30% after 9 days submergence at ... | 2001 | 11686618 |
| cytogenetic investigations on seven palaearctic weevil species (coleoptera, curculionidae). | cytogenetic investigations were carried out on seven species of bisexual weevils from five subfamilies. the following numbers of chromosomes were found in individual species: 2n = 22, n male = 10 + xyp in ptochus porcellus boh. (otiorhynchinae); 2n = 40, n male = 19 + xyp in larinodontes turbinatus gyll. (cleoninae); 2n = 26, n male = 12 + xyp in curculio pellitus (boh.) (curculioninae); 2n = 30, n male = 14 + xyp in acalles camelus (f.), acalles echinatus (germ.), acalles hypocrita boh. (crypto ... | 2001 | 11732166 |
| the evolution of agriculture in beetles (curculionidae: scolytinae and platypodinae). | beetles in the weevil subfamilies scolytinae and platypodinae are unusual in that they burrow as adults inside trees for feeding and oviposition. some of these beetles are known as ambrosia beetles for their obligate mutualisms with asexual fungi--known as ambrosia fungi--that are derived from plant pathogens in the ascomycete group known as the ophiostomatoid fungi. other beetles in these subfamilies are known as bark beetles and are associated with free-living, pathogenic ophiostomatoid fungi ... | 2001 | 11761062 |
| response of plum curculio (coleoptera: curculionidae) to odor-baited traps near woods. | response of overwintered plum curculios, conotrachelus nenuphar (herbst), to odor-baited traps was evaluated from the beginning until nearly the end of emigration from overwintering sites in woods. we evaluated clear sticky plexiglas panels and black pyramid traps placed close to woods adjacent to apple trees in an unsprayed section of an orchard. traps were baited with aggregation pheromone (grandisoic acid) alone or in combination with one of six synthetic fruit volatiles (benzaldehvde, decyl ... | 2001 | 11777040 |
| ecology and phenology of the boll weevil (coleoptera: curculionidae) on an unusual wild host, hibiscus pernambucensis, in southeastern mexico. | the phenology and ecology of hibiscus pernambucensis arruda and its interaction and importance in maintaining populations of the boll weevil, anthonomus grandis boheman, were studied over a period of 3 yr in the soconusco region of the state of chiapas, mexico. h. pernambucensis is a small tree of neotropical distribution, restricted to lowland areas, and generally associated with halophytic vegetation. this species is found exclusively along the shores of brackish estuaries, in or near mangrove ... | 2001 | 11777042 |
| an aquatic light trap designed for live capture of predatory tropisternus sp (coleoptera: hydrophilidae) larvae in arkansas rice fields. | construction of an aquatic light trap developed for the live capture of 3rd-stage larvae of predatory tropisternus sp. for use in laboratory bioassays against larvae of anopheles quadrimaculatus and psorophora columbiae is described. on 10 occasions, an average of 5.2 traps was used per evening, resulting in 52 trap-nights that accumulated 106.7 h of trapping time, or an average of 10.6 h per trap. use of 2 heavy-duty alkaline d-sized batteries and appropriate in-circuit resistance effectively i ... | 2001 | 11804467 |
| digestive proteases during development of larvae of red palm weevil, rhynchophorus ferrugineus (olivier, 1790) (coleoptera: curculionidae). | the evolution of digestive proteases during larval development of rhynchophorus ferrugineus (olivier, 1790) has been studied. a progressive increase of protease activity has been found. the optimum ph for proteolytic activity against azocasein was determined. caseinograms revealed an active complex of alkaline proteases from the early stages of the development. from the apparent molecular masses, three groups of proteases have been found - high molecular-mass proteases, medium molecular-mass pro ... | 2002 | 11804798 |
| pine weevil (hylobius abietis) antifeedants from lodgepole pine (pinus contorta). | pine weevils (hylobius abietis) fed less on bark of lodgepole pine (pinus contorta) than on bark of scots pine (p. sylvestris). two pine weevil antifeedants, ethyl trans-cinnamate and ethyl 2,3-dibromo-3-phenyl-propanoate, were isolated from bark of lodgepole pine. these two compounds significantly reduced pine weevil feeding in a laboratory bioassay. in field assays, the second compound significantly decreased pine weevil damage on planted seedlings. ethyl 2,3-dibromo-3-phenylpropanoate has not ... | 2001 | 11817079 |
| plant alpha-amylase inhibitors and their interaction with insect alpha-amylases. | insect pests and pathogens (fungi, bacteria and viruses) are responsible for severe crop losses. insects feed directly on the plant tissues, while the pathogens lead to damage or death of the plant. plants have evolved a certain degree of resistance through the production of defence compounds, which may be aproteic, e.g. antibiotics, alkaloids, terpenes, cyanogenic glucosides or proteic, e.g. chitinases, beta-1,3-glucanases, lectins, arcelins, vicilins, systemins and enzyme inhibitors. the enzym ... | 2002 | 11856298 |
| population genetic structure of tomicus piniperda l. (curculionidae: scolytinae) on different pine species and validation of t. destruens (woll.). | genetic diversity and population structure of tomicus piniperda was assessed using mitochondrial sequences on 16 populations sampled on 6 pine species in france. amplifications of internal transcribed space 1 (its1) were also performed. our goals were to determine the taxonomic status of the mediterranean ecotype t. piniperda destruens, and to test for host plant or geographical isolation effect on population genetic structure. we showed that t. piniperda clusters in two mtdna haplotypic groups. ... | 2002 | 11918783 |
| structure and development of ovaries in the weevil, anthonomus pomorum (coleoptera, polyphaga). i. somatic tissues of the trophic chamber. | in developing ovarioles of anthonomus pomorum (coleoptera, polyphaga, curculionidae) the trophic chambers (tropharia) are relatively large and consist of clusters (clones) of germ cells and various somatic tissues. each ovariole is enclosed within an outer epithelial sheath (tunica externa). throughout the pupal phase, the growth of this sheath is accelerated and precedes the development of the rest of the ovariole. as a result, the epithelial sheath proliferates anteriorly and forms an elongate ... | 2001 | 11987459 |
| common environmental allergens causing respiratory allergy in india. | respiratory allergy affects all age groups but the children are the worst affected by the respiratory allergy. bioparticles from different biological sources are the main cause of allergy. pollen grains, fungal spores, insect and other materials of biological origin form the most important allergen load in the air. for the efficient diagnosis of the allergy and its effective treatment it is very important to know about the prevalence, seasonal and annual variations of aeroallergens of the area. ... | 2002 | 12003301 |
| inheritance of null alleles for microsatellites in the white pine weevil (pissodes strobi [peck] [coleoptera: curculionidae]). | four families of the white pine weevil (pissodes strobi) produced by controlled breeding were used to study the mode of inheritance at four microsatellite loci. the results confirmed the mendelian segregation of all loci. three of the four loci showed the presence of null alleles. the observed high polymorphism of p. strobi microsatellites increased their usefulness for paternity determination. the presence of null alleles predicates the need to redesign primers before using them in population g ... | 2002 | 12011182 |
| mango seed weevil (coleoptera: curculionidae) and premature fruit drop in mangoes. | the effect of infestations of mango seed weevil, sternochetus mangiferae (f.), on premature fruit drop of mangoes was investigated. mango fruits ('haden') of equal size were collected both off the ground and from the tree at four times during the season (june-august). if weevil-infested fruit were more prone to dropping than uninfested fruit, the prediction was that a higher infestation rate would be found in fruit on the ground compared with fruit on the tree. average fruit weight was used as a ... | 2002 | 12020010 |
| evaluation of pseudostem trapping as a control measure against banana weevil, cosmopolites sordidus (coleoptera: curculionidae) in uganda. | controlled studies to determine the efficacy of pseudostem trapping in reducing adult populations of the banana weevil, cosmopolites sordidus (germar), were conducted under farmer conditions in ntungamo district, uganda. twenty-seven farms were stratified on the basis of c. sordidus population density (estimated by mark and recapture methods) and divided among three treatments: (i) researcher-managed trapping (one trap per mat per month): (ii) farmer-managed trapping (trap intensity at discretio ... | 2002 | 12020360 |
| insect pests of eucalypts in california: implications of managing invasive species. | for the first 150 years following their introduction, eucalypts planted in the california landscape were free of both insect pests and diseases. in the last 15 years, numerous herbivorous insect species have been introduced accidentally into the state and have caused significant damage to the trees. several of these species, e.g. phoracantha semipunctata (fabricius), phoracantha recurva newman (coleoptera: cerambycidae) and gonipterus scutellatus gyllenhal (coleoptera: curculionidae), have also ... | 2002 | 12020373 |
| the influence of plant age on tolerance of rice to injury by the rice water weevil, lissorhoptrus oryzophilus (coleoptera: curculionidae). | for most plant species, tolerance to many types of herbivory increases as plants age, but the applicability of this pattern to root herbivory has not been tested. injury to roots of rice plants by larvae of the rice water weevil, lissorhoptrus oryzophilus kuschel, causes severe reductions in yields in the united states. it is generally thought that young rice plants, because their root systems are smaller, are less tolerant than older plants of root feeding by l. oryzophilus. field experiments w ... | 2002 | 12020377 |
| inter- and intraspecific genetic variation and differentiation in the sibling bean weevils zabrotes subfasciatus and z. sylvestris (coleoptera: bruchidae) from mexico. | 2002 | 12020378 | |
| incongruence between morphological and mitochondrial-dna characters suggests hybrid origins of parthenogenetic weevil lineages (genus aramigus). | an expanded matrix of morphological characters for the genus aramigus (coleoptera: curculionidae), which includes numerous polyploid parthenogenetic lineages, was compared and combined with a published matrix of mitochondrial dna (mtdna) characters. the matrix of morphological characters provides little resolution of the a. tessellatus and a. uruguayensis species complexes but does resolve previously unresolved relationships among other morphologically defined species (a. globoculus + a. interme ... | 1998 | 12066688 |
| piperidine alkaloids in sitka spruce with varying levels of resistance to white pine weevil (coleoptera: curculionidae). | our objective was to evaluate piperidine alkaloids as potential resistance factors in sitka spruce, picea sitchensis (bong.) carr, at risk to attack by white pine weevils, pissodes strobi (peck). we sampled 72 seedlings in each of two replicated field trials in the oregon coast range. the seedlings were grown from open-pollinated seeds of putatively "resistant" or "susceptible" off-site parental sources. alkaloid concentrations in bark and foliage were measured in previously unattacked trees at ... | 2002 | 12076008 |
| methyl jasmonate induces traumatic resin ducts, terpenoid resin biosynthesis, and terpenoid accumulation in developing xylem of norway spruce stems. | norway spruce (picea abies l. karst) produces an oleoresin characterized by a diverse array of terpenoids, monoterpenoids, sesquiterpenoids, and diterpene resin acids that can protect conifers against potential herbivores and pathogens. oleoresin accumulates constitutively in resin ducts in the cortex and phloem (bark) of norway spruce stems. de novo formation of traumatic resin ducts (tds) is observed in the developing secondary xylem (wood) after insect attack, fungal elicitation, and mechanic ... | 2002 | 12114556 |
| cuticular hydrocarbons of the ectoparasitic wasp cephalonomia hyalinipennis (hymenoptera: bethylidae) and its alternative host, the stored product pest caulophilus oryzae (coleoptera: curculionidae). | cuticular hydrocarbons of an ectoparasitic wasp attacking two beetle hosts have been identified and examined for the influence of age, gender, mating status, and host on hydrocarbon composition. the 37 wasp hydrocarbons identified consisted of a series of n-alkanes (c16 to c33), 3-, 5-, 9-, 10-, 11-, and 12-methyl alkanes and a series of z-7 and z-9 monoenes (c23:1 to c27:1). one c25:2 diene was found. no effects of hydrocarbon composition as a function of age, gender, or mating status were foun ... | 2002 | 12173292 |
| host-recognizing kairomones for parasitic wasp, anisopteromalus calandrae, from larvae of azuki bean weevil, callosobruchus chinensis. | host-recognizing kairomones for the stinging behavior of the parasitic wasp, anisopteromalus calandrae, were identified on host azuki bean weevil larvae, callosobruchus chinensis (l.). the kairomones were extracted with acetone from chinese green beans, from which emerged wasps and host weevils had been removed. the kairomones are a mixture of triacylglycerols and fatty acids, each of which is separately active, and with no observable synergistic effect between them. these compounds are known to ... | 2002 | 12184398 |
| sexual reproduction in the white pine weevil (pissodes strobi [peck] [coleoptera: curculionidae]): implications for population genetic diversity. | controlled mating experiments in the white pine weevil (pissodes strobi [peck]) indicated that female weevils either stored sperm or fertilized eggs from one season to the next, and were able to colonize sitka spruce (picea sitchensis [bong.] carr.) trees without additional mating events. this was interpreted as being beneficial for the insect, in that population establishment in a new habitat could be initiated by dispersing previously mated females without participation of the male. this makes ... | 2002 | 12195030 |
| correspondence of high levels of beta-exotoxin i and the presence of cry1b in bacillus thuringiensis. | examination of 640 natural isolates of bacillus thuringiensis showed that the 58 strains (9%) whose supernatants were toxic to anthonomus grandis (coleoptera: curculionidae) produced between 10 and 175 micro g of beta-exotoxin i per ml. we also found that 55 (46%) of a sample of 118 strains whose culture supernatants were not toxic to a. grandis nevertheless produced between 2 and 5 micro g/ml. however, these amounts of beta-exotoxin i were below the threshold for detectable toxicity against thi ... | 2002 | 12200263 |
| type iii secretion systems and the evolution of mutualistic endosymbiosis. | the view that parasites can develop cooperative symbiotic relationships with their hosts is both appealing and widely held; however, there is no molecular genetic evidence of such a transition. here we demonstrate that a mutualistic bacterial endosymbiont of grain weevils maintains and expresses inv/spa genes encoding a type iii secretion system homologous to that used for invasion by bacterial pathogens. phylogenetic analyses indicate that inv/spa genes were present in presymbiotic ancestors of ... | 2002 | 12213957 |
| effect of neem seed extract on feeding, growth, survival, and reproduction of diaprepes abbreviatus (coleoptera: curculionidae). | a commercially available neem seed extract, neemix 4.5, containing 4.5% azadirachtin (aza), was assessed for biological activity against the root weevil diaprepes abbreviatus (l.), an important exotic insect pest of florida citrus. laboratory bioassays against neonatal and 3-wk-old larvae fed sliced carrot treated with neemix produced dose-dependent larval mortality and reduced fresh weights among survivors of treatments. the weight response was greater than the mortality response for both larva ... | 2002 | 12216804 |
| flooding influences ovipositional and feeding behavior of the rice water weevil (coleoptera: curculionidae). | the rice water weevil, lissorhoptrus oryzophilus kuschel, is the most destructive insect pest of rice in the united states. as part of an effort to develop strategies to manage this pest, the ovipositional and feeding habits of l. oryzophilus on rice plants subjected to different flooding treatments were characterized in greenhouse studies. presence and depth of flood had a direct influence on the ovipositional behavior of weevils in no-choice studies. more eggs were found in flooded plants than ... | 2002 | 12216811 |
| alfalfa weevil (coleoptera: curculionidae) larval sampling: comparison of shake-bucket and sweep-net methods and effect of training. | two field-sampling methods, shake-bucket and sweep-net, were compared for use in monitoring alfalfa weevil, hypera postica (gyllenhal), larvae in alfalfa hay of the high plains and intermountain region of north america. in this region, alfalfa grows to sufficient height to use both methods before the more damaging late instars peak in abundance. both methods also were compared with extracting larvae by using berlese funnels in the laboratory. the shake-bucket method was more sensitive in detecti ... | 2002 | 12216816 |
| effects of kaolin-based particle film application on boll weevil (coleoptera: curculionidae) injury to cotton. | this study examined a non-insecticidal tactic for suppressing boll weevil, anthonomus grandis grandis boheman, damage to cotton, gossypium hirsutum l. in cage assays, kaolin, a reflective white mineral, applied to excised cotton squares or to the cotton foliage, initially resulted in lower levels of boll weevil injury to squares than nontreated squares. boll weevil oviposition and feeding on kaolin-treated squares and squares on kaolin-treated cotton plants increased when nontreated squares and ... | 2002 | 12216817 |
| sampling methods as abundance indices for adult diaprepes abbreviatus (coleoptera: curculionidae) in citrus. | beat sampling and two type of traps, cup traps and tedders traps, were evaluated as sampling methods to detect and estimate population densities of adult diaprepes abbreviatus l. weevils newly colonizing young citrus trees. the study was conducted over a 65-wk period across a 0.25-ha area of 80 citrus trees [citrus sinensis (l.) osbeck] (1.2-1.5 m tall). beat samples were taken weekly to determine the number of trees infested and number of new adult weevils per tree. sixteen of the 80 trees stud ... | 2002 | 12216831 |
| elongation factor 1 alpha resolves the monophyly of the haplodiploid ambrosia beetles xyleborini (coleoptera: curculionidae). | elongation factor 1-alpha was used to test the monophyly of the wood boring beetle tribe xyleborini, where all species are haplodiploid and perform regular inbreeding by brother-sister mating. due to their feeding requirements, being highly dependent on ophiostomatoid fungi which they cultivate in wood tunnels, monophyly may be expected due to nutritional constraints. during the course of analyses, two copies of ef-1alpha were amplified in these beetles, differing in intron structure. the high s ... | 2002 | 12230544 |
| the influence of crop management on banana weevil, cosmopolites sordidus (coleoptera: curculionidae) populations and yield of highland cooking banana (cv. atwalira) in uganda. | a field study was undertaken in uganda using highland cooking banana (cv. atwalira) to test the hypothesis that bananas grown under stressed conditions are more susceptible to attack by cosmopolites sordidus (germar). four banana treatments were employed to create different levels of host-plant vitality: (1) high stress: intercrop with finger millet; (2) moderate stress: monoculture without soil amendments; (3) low stress: monoculture with manure; (4) high vigour: monoculture with continuous mul ... | 2002 | 12241566 |
| pheromone-based trapping of west indian sugarcane weevil in a sugarcane plantation. | attraction of metamasius hemipterus (oliver) to gallon and bamboo traps baited with insecticide-treated sugarcane, the male-produced pheromone, 4-methyl-5-nonanol, and 2-methyl-4-heptanol is more efficient if ethyl acetate is added. the optimal traps are ground-level gallon traps baited with insecticide-laced sugarcane, pheromone, and ethyl acetate. capture rates of ground-level gallon traps are doubled by placing an insecticide-laced pad under the trap, but significantly decreased by placing th ... | 2002 | 12371817 |
| molecular and morphological phylogenetics of weevils (coleoptera, curculionoidea): do niche shifts accompany diversification? | the main goals of this study were to provide a robust phylogeny for the families of the superfamily curculionoidea, to discover relationships and major natural groups within the family curculionidae, and to clarify the evolution of larval habits and host-plant associations in weevils to analyze their role in weevil diversification. phylogenetic relationships among the weevils (curculionoidea) were inferred from analysis of nucleotide sequences of 18s ribosomal dna (rdna; approximately 2,000 base ... | 2002 | 12396590 |
| efficacy of the organic-certified insecticide diatect ii against the boll weevil (anthonomus grandis) in cotton. | the efficacy of the organic insecticide diatect ii against boll weevil (anthonomus grandis boheman) in cotton (gossypium hirsutum l) in the lower rio grande valley of texas were assessed in small-plot field trials and greenhouse cage tests using azinphos-methyl treatments as a standard for comparison. plastic sheets were placed in the furrows of the treated plots to retrieve boll weevils which dropped from the plants after being killed by the insecticides. samples of live weevils taken by a trac ... | 2002 | 12400443 |
| is there meaningful plant resistance to diaprepes abbreviatus (coleoptera: curculionidae) in citrus rootstock germplasm? | host plant resistance to the diaprepes root weevil, diaprepes abbreviatus (l.) was assessed for seedlings of 54 poncirus trifoliata (l.) raf. selections and two families of progeny from crosses between citrus and p. trifoliata. weight gain was consistently lower when larvae were reared in pots containing the progeny of citrus reticulata blanco 'sunki' x p. trifoliata 'flying dragon' compared with larvae reared on progeny of 'pearl' (c. reticulata x c. paradisi macf.) x 'flying dragon'. this is t ... | 2002 | 12403435 |
| effectiveness of igrs (cga-184699) and (cga-259205) on the respiratory metabolism of the red palm weevil, rhynchophorus ferrugineus (coleoptera: curculionidae). | prepupae of rhynchophorus ferrugineus were topically applied with one of three dose-levels (1.00, 0.10 or 0.01 microgram/insect) of lufenuron (cga-184699) or diofenolan (cga-259205). the daily o2 consumption and co2-output were determined and the respiratory quotient (rq) was calculated. lufenuron prohibited the pupae to consume o2, regardless of their age. considering the co2 release, this igr exerted an inhibitory action on pupae increasingly correlated with the increasing dose-level. volumes ... | 2001 | 12425062 |
| protection of stored maize against sitophilus zeamais (motsch.) by use of essential oils of spices from cameroon. | in storage, maize as other cereals is currently attacked by insects. the main specie present in cameroon is sitophilus zeamais (coleop. curculionidae). the popular way to prevent its damages is the use of synthetic insecticides. these chemicals extend their activities to non target animals. they are potentially dangerous for consumers and are implicated in the pollution of the environment. the development of products killing pests which are consumer-friendly is to be improved. in this respect, t ... | 2001 | 12425068 |
| respiratory metabolic responsiveness during the pupal stage of the red palm weevil, rhynchophorus ferrugineus (coleoptera: curculionidae) to certain plant extracts. | the prepupae of rhynchophorus ferrugineous were topically applied with one of three dose-levels (0.1, 0.005 or 0.001 microgram/insect) of jojoba oil (joj) or azadirachtin (azt). the daily o2 consumption and co2 respiratory output were determined and the respiratory quotient (rq) was calculated. after joj treatments, o2 consumption of early- and late pupae increased as the dose-level was decreased. the respiration curve did not assume an u-shaped pattern as common in the pupal stage of many insec ... | 2001 | 12425070 |
| a comparison of recommended and reduced insecticide regimes in alfalfa. | the objective of this study was to evaluate the effects of the recommended rates of insecticides applied at two different population levels of the alfalfa weevil, hypera variabilis hbst. (coleoptera: curculionidae) and the reduced levels of insecticides on alfalfa weevil, predators and yield in 1998 and 1999. more specific objective was to search for options to reduce insecticide usage while implementing an effective pest control, thereby developing more economically and environmentally sound al ... | 2001 | 12425072 |
| effects of neem-based and chemical insecticides on some arthropods in alfalfa. | in this study, we tested the effects of two different doses of neem (azadirachtin) on the alfalfa weevil, hypera variabilis hbst. (coleoptera: curculionidae), aphids and predators (coccinellids, anthocorids, chrysopids and spiders) and compared the effects with those of a broad spectrum insecticide (malathion) in a controlled experiment in 1998 and 1999. malathion treatments reduced alfalfa weevil densities significantly (p < 0.01) by 77.9 and 87.4% in 1998 and 1999, respectively. alfalfa weevil ... | 2001 | 12425073 |
| efficacy of ethiprole applied alone and in combination with conventional insecticides for protection of stored wheat and stored corn. | the insecticidal pyrazole ethiprole, applied at rates of 7.5 and 10.0 ppm either alone or in combination treatments with deltamethrin, piperonyl butoxide, and chlorpyrifos-methyl, was evaluated as a protectant of stored wheat and stored corn. the commodities were treated with six treatment combinations, including an untreated control, and held for 6 mo at 22, 27, or 32 degrees c and 57% rh. bioassays were conducted monthly by exposing the rice weevil, sitophilus oryzae (l.), and the red flour be ... | 2002 | 12539848 |
| hole density and capture of stored-product insect pests in grain probe traps. | the relationship between number of holes in a grain probe trap body and capture of stored-grain pests was determined in laboratory tests using adults of the rice weevil, sitophilus oryzae (l.), the sawtoothed grain beetle, oryzaephilus surinamensis (l.), and the red flour beetle, tribolium castaneum (herbst). polyvinylchloride (pvc) probe bodies were attached to electronic sensor heads, and insect captures were recorded electronically using an electronic grain probe insect counter (egpic) system ... | 2002 | 12539850 |
| bruchins, plant mitogens from weevils: structural requirements for activity. | bruchins are 3-hydroxypropanoate esters of long-chain alpha,omega-diols from pea weevils and cowpea weevils that have been shown to initiate callus formation on pea pods at extremely low application rates. synthetic analogs have been prepared and examined to evaluate structural requirements for inducing this unusual neoplastic response. chain length (optimum length c22-c24) is important, whereas unsaturation within the chain is relatively unimportant. difunctionality is required for maximum acti ... | 2002 | 12564796 |
| meliternatin: a feeding deterrent and larvicidal polyoxygenated flavone from melicope subunifoliolata. | we screened more than 60 malaysian plants against two species of insects and found that melicope subunifoliolata (stapf) t.g. hartley (rutaceae) showed strong feeding deterrent activity against sitophilus zeamais motsch. (curculionidae) and very good larvicidal activity against aedes aegypti l. (diptera). one anti-insect compound, meliternatin (3,5-dimethoxy-3',4',6,7-bismethylendioxyflavone) (6) and six other minor polyoxygenated flavones were isolated from m. subunifoliolata. | 2003 | 12591266 |
| karyological notes on six beetle species from armenia (coleoptera: tenebrionidae, cerambycidae, curculionidae). | karyotypic details were studied in males of six beetle species from three families, viz. tenebrionidae: dailognatha pumila bdy. (2n = 20, n(male) = 9 + xy(p)), pachyscelis musiva ménétr. (2n = 18, n(male) = 8 + xy(p)), pimelia capito kryn. (2n = 18, n(male) = 8 + xy(p)); cerambycidae: agapanthia walteri reitt. (2n = 20, n(male) = 9+xy(p)), agapanthia korostelevi danilevsky (2n = 20, n(male) = 9 + xy(p)); curculionidae: phyllobius caucasicus stierl. (2n = 22, n(male) = 10 + xy(p)). the chromosome ... | 2002 | 12597526 |
| spatial responses of two herbivore groups to a geometrid larva on mountain birch. | direct or plant-mediated interactions between herbivores may modify their spatial distribution among and within plants. in this study, we examined the effect of a leaf-chewing geometrid, the autumnal moth (epirrita autumnata), on two different herbivore groups, leaf rolling deporaus betulae weevils and eriocrania spp. leafminers, both feeding on mountain birch (betula pubescens ssp. czerepanovii). the exact locations of herbivores within tree canopies were mapped during three successive summers. ... | 2003 | 12647161 |
| transgenic expression of trypsin inhibitor cme from barley in indica and japonica rice, confers resistance to the rice weevil sitophilus oryzae. | indica and japonica rice (oryza sativa l.) plants were transformed by particle bombardment with the itr1 gene encoding the barley trypsin inhibitor bti-cme, under the control of its own promoter that confers endosperm specificity, and the maize ubiquitin promoter. from 38 independent transgenic lines of indica (breeding line ir58) and 15 of the japonica (cv senia) selected, 22 and 11, respectively, expressed the barley inhibitor at detectable levels. the transgene was correctly translated as ind ... | 2003 | 12650522 |
| identification of plant odours activating receptor neurones in the weevil pissodes notatus f. (coleoptera, curculionidae). | plants release complex mixtures of volatiles important in the interaction with insects and other organisms. in the search for compounds that contribute to the perception of odour quality in the weevil pissodes notatus, single olfactory receptor neurones on the antennae were screened for sensitivity to naturally produced plant volatiles by the use of gas chromatography linked to single cell recordings. we here present 60 olfactory neurones responding to 25 of the numerous compounds released by ho ... | 2003 | 12664096 |
| susceptibility of the boll weevil to steinernema riobrave and other entomopathogenic nematodes. | the susceptibility of the boll weevil (bw), anthonomus grandis boheman, to steinernema riobrave and other nematode species in petri dishes, soil (hidalgo sandy clay loam), and cotton bolls and squares was investigated. third instar weevils were susceptible to entomopathogenic nematode (en) species and strains in petri dish bioassays at 30 degrees c. lower lc(50)'s occurred with s. riobrave tx- 355 (2 nematodes per weevil), s. glaseri nc (3), heterorhabditis indicus hom-1 (5), and h. bacteriophor ... | 2003 | 12676555 |
| action of pyrethrum-based formulations against grain weevils. | pyrethrum extract, containing six insecticidal esters, has a long history of successful application in the control of stored products. its low environmental hazard makes it an ideal pesticide for outdoor pre-harvest treatment. however the disadvantage of its low light stability then becomes apparent. this drawback can be overcome by the complexation of pyrethrum extract with gamma-cyclodextrin. primary object of the conducted studies was to investigate the effect of complexation upon the insecti ... | 2003 | 12695024 |
| oviposition plasticity in sitophilus zeamais (motsch.) (coleoptera: curculionidae). | the oviposition plasticity (term used here to refer to the phenomenon whereby some insects reduce egg laying in poor conditions and increase it when conditions improve) of sitophilus zeamais, one of the most serious insect pests to maize during grain storage, was investigated in different food resources. whether such oviposition plasticity exists, it can be investigated by finding if more eggs are subsequently laid by insects previously kept on unfavourable environment than by insects previously ... | 2002 | 12696418 |
| proteolytic gut activities in the rice water weevil, lissorhoptrus brevirostris suffrian (coleoptera: curculionidae). | digestive endoprotease activities of the rice water weevil, lissorhoptrus brevirostris suffrian (coleoptera: curculionidae), were characterized based on the ability of gut extracts to hydrolyze specific synthetic substrates, optimal ph, and hydrolysis sensitivity to protease inhibitors. larvae of this species were found to use a complex proteolytic system that includes cathepsin d-, cathepsin b-, trypsin-, and chymotrypsin-like activities. trypsin-like activity was evenly distributed among the a ... | 2003 | 12701111 |
| heterochromatic banding patterns on chromosomes of twelve weevil species (insecta, coleoptera, curculionoidea: apionidae, curculionidae). | the c-banding patterns of twelve weevil species are presented. the obtained results confirm the existence of two groups of species: with a small or large amount of heterochromatin in the karyotype. the first group comprises seven species (apionidae: holotrichapion pisi; curculionidae: phyllobius urticae, ph. pyri, ph. maculicornis, tanymecus palliatus, larinodontes turbinatus, cionus tuberculosus). in weevils with a small amount of heterochromatin, tiny grains on the nucleus in interphase are vi ... | 2002 | 12729158 |
| structure and development of ovaries in the weevil, anthonomus pomorum (coleoptera, polyphaga). ii. germ cells of the trophic chamber. | the analysis of the germ cell cluster formation in anthonomus pomorum (coleoptera, polyphaga, curculionidae) has revealed that both linear and branched clones of cystocytes occur in the pupa stage. in the branched clones a poorly developed polyfusome is formed and cystocytes with maximally 3 intercellular bridges were found. in the linear clones the polyfusomes are absent. further divisions of cystocytes produce exclusively linearly arranged cells. just after metamorphosis (imago-a stage), the p ... | 2002 | 12729160 |
| characterization of a high-affinity binding site for the pea albumin 1b entomotoxin in the weevil sitophilus. | the toxicity of the pea albumin 1b (pa1b), a 37 amino-acid peptide extracted from pea seeds, for cereal weevils (sitophilus oryzae, sitophilus granarius and sitophilus zeamais) was recently discovered. the mechanism of action of this new entomotoxin is still unknown and potentially involves a target protein in the insect tissues. this work describes the characterization of a high-affinity binding site for pa1b in a microsomal fraction of sitophilus spp. extracts. purified pa1b was labeled to a h ... | 2003 | 12755698 |
| sources of semiochemicals mediating host finding in callosobruchus chinensis (coleoptera: bruchidae). | bruchid pests such as callosobruchus chinensis (linnaeus) endanger stored legume seeds throughout the tropical belt. the chemical composition of the headspace volatiles from healthy and fourth instar larvae-infested cowpea seeds were identified, characterized, and compared using gas chromatography-mass spectrometry. y-tube olfactometer bioassays were performed to evaluate the effect of these chemicals on the orientation of conspecific adult females. analysis of volatiles released from healthy an ... | 2003 | 12762860 |
| two strains of cabbage seed weevil (coleoptera: curculionidae) exhibit differential susceptibility to a transgenic oilseed rape expressing oryzacystatin i. | the aim of this study was to assess the potential effect of a transgenic line of oilseed rape expressing oryzacystatin i (oci) on two strains of cabbage seed weevil. the level of oci expression in seeds was approximately 0.05% of total soluble proteins. the insects were field-collected in two different locations, and their progeny was analyzed after a 3 week-development in pods. both strains showed a similar pattern of proteolytic activity, and similar levels of oci-sensitive proteinase activity ... | 1998 | 12769939 |
| a hexamerin protein, agsp-1, is associated with diapause in the boll weevil(1). | the objective of this research was to identify a reliable biochemical indicator for diapause (dormancy) in the boll weevil, anthonomus grandis. hemolymph polypeptides from reproductive and diapausing weevils were compared using denaturing sodium dodecyl sulpfate (sds)-polyacrylamide gel electrophoresis (page). a 77-kda protein, which proved to be a hexamerin (agsp-1), strongly correlated with morphological diapause characters in both male and female adult weevils. n-terminal sequence analysis id ... | 2002 | 12770051 |
| loss of dna recombinational repair enzymes in the initial stages of genome degeneration. | many obligate intracellular pathogens and symbionts undergo genome degeneration during long-term association with eukaryotic hosts; however, very little is known about genome changes that occur in the initial stages of such intracellular associations. by focusing on a clade of bacteria that have recently established symbiotic associations with insect hosts, we have identified events that may contribute to the reduction and degeneration of symbiont genomes. unlike virtually all other bacteria, th ... | 2003 | 12777518 |
| effects of routine late-season field operations on numbers of boll weevils (coleoptera: curculionidae) captured in large-capacity pheromone traps. | flat and cylindrical adhesive boll weevil, anthonomus grandis grandis boheman (coleoptera: curculionidae), pheromone traps captured significantly more (p < or = 0.05) boll weevils than the hercon (hercon environmental, emigsville, pa) trap during the late cotton-growing season, and larger adhesive areas were associated with higher captures; a flat plywood board collected the most boll weevils because it had the largest surface area. the flat board trap, chosen for measuring large late-season adu ... | 2003 | 12852605 |
| toxicity and repellency of tephrosia candida to larval and adult diaprepes root weevil (coleoptera: curculionidae). | leaves of the tropical legume tephrosia candida dc deterred feeding by adults of the diaprepes root weevil, diaprepes abbreviatus (l.), compared with leaves of citrus macrophylla wester, a common citrus rootstock, or t. vogelii hook. f. when larvae were placed in pots containing plants of the three species for 28 d in a growth chamber, larval survival and weight gain were significantly reduced in pots containing plants of t. candida compared with larvae in pots with c. macrophylla or t. vogelii. ... | 2003 | 12852621 |
| odor-baited trap trees: a new approach to monitoring plum curculio (coleoptera: curculionidae). | we compared a trap approach with a trap-tree approach to determine the need and timing of insecticide applications against overwintered adult plum curculios, conotrachelus nenuphar (herbst.), in commercial apple orchards in massachusetts in 2002. all traps and trap trees were baited with benzaldehyde (attractive fruit odor) plus grandisoic acid (attractive pheromone). sticky clear plexiglas panel traps placed at orchard borders, designed to intercept adults immigrating from border areas by fligh ... | 2003 | 12852623 |
| abundance of diaprepes abbreviatus (l.) (coleoptera: curculionidae) neonates falling to the soil under tree canopies in florida citrus groves. | the purpose of these experiments was to estimate the number and distribution of diaprepes abbreviatus (l.) neonate larvae dropping from the canopy of infested citrus trees. the number of neonates was monitored in the field using passive funnel traps in two simultaneous experiments and a separate experiment for an additional year. in one experiment, traps were placed from trunk to dripline in the cardinal directions under each of five trees (132 traps total). in a second experiment, eight traps w ... | 2003 | 12852624 |
| effect of ulv malathion use in boll weevil (coleoptera: curculionidae) eradication on resistance in the tarnished plant bug (heteroptera: miridae). | tarnished plant bugs, lygus lineolaris (palisot de beauvois), from regions 1, 2, and 3 of the boll weevil, anthonomous grandis boheman, eradication program in mississippi were collected from wild hosts and tested for malathion resistance during the spring and fall of 2000 and 2001. plant bugs were also tested in region 1 in late-july and october of 1999, just before and after multiple applications of ultra-low-volume (ulv) malathion were used for reproduction-diapause control of boll weevils in ... | 2003 | 12852634 |
| wheat in bins and discharge spouts, and grain residues on floors of empty bins in concrete grain elevators as habitats for stored-grain beetles and their natural enemies. | wheat stored in upright concrete bins at seven grain elevators in central kansas was sampled intermittently for insects over a 2.5-yr period by collecting samples from the upper half of the grain mass, from the discharge spout at the base of the bins, and from residue remaining in empty bins before the 2000 wheat harvest. samples were taken from the grain mass with a power vacuum sampler (pv) and from the discharge spouts (ds) by dropping grain onto the reclaim belt beneath the bins. the density ... | 2003 | 12852647 |
| evolution of clonality and polyploidy in a weevil system. | the increased interest in asexual organisms calls for in-depth studies of asexual complexes that actively give rise to new clones. we present an extensive molecular study of the otiorhynchus scaber (coleoptera, curculionidae) weevil system. three forms have traditionally been recognized: diploid sexuals, triploid, and tetraploid parthenogens. all forms coexist in a small central area, but only the polyploid parthenogens have colonized marginal areas. analyzing the phylogenetic relationship, base ... | 2003 | 12885970 |
| insect attack and wounding induce traumatic resin duct development and gene expression of (-)-pinene synthase in sitka spruce. | conifers possess inducible terpenoid defense systems. these systems are associated with the formation of traumatic resin ducts (trd) and are underpinned by enhanced gene expression and activity of terpene synthases (tps), enzymes responsible for oleoresin formation. we first determined that sitka spruce (picea sitchensis [bong.] carriere) had the capacity for trd formation by mechanically wounding representative trees. we then proceeded to investigate whether the white pine weevil (pissodes stro ... | 2003 | 12970502 |
| prolonged diapause of specialist seed-feeders makes predator satiation unstable in masting of quercus crispula. | quercus crispula (= q. mongolica var. grosseserrata) is the predominant tree species in cool temperate, mixed broadleaf/conifer forests in northern japan. we compared 11 years of data on acorn production in a population of q. crispula, with data on seed-insect populations, to try to answer the following questions: (1) does q. crispula show a regular pattern of masting? (2) how long do principal seed predators remain in diapause? (3) how do the seed predators affect the pattern of predator satiat ... | 2003 | 13680352 |
| [on species of eutinobothrus (col., curculionidae, cryptohynchinae)]. | 1963 | 14141130 | |
| mycetomal and other microorganisms in young and aging sitophilus (coleoptera: curculionidae). | 1964 | 14222664 | |
| [cytology of parthenogenetic curculionidae in switzerland]. | 1954 | 14364724 | |
| [sterilizing action of x-rays on corn weevils]. | 1959 | 14424485 | |
| some media used in an attempt to isolate and culture the mycetomal microorganisms of sitophilus weevils. | 1961 | 14477536 | |
| evidence for a male-produced aggregation pheromone in scyphophorus acupunctatus gyllenhal (coleoptera: curculionidae). | olfactory response of male and female scyphophorus acupunctatus gyllenhal (coleoptera: curculionidae) to volatiles released from the same or opposite conspecifics alone, or combined with host plant volatiles, was evaluated in the laboratory and field. we also evaluated the response to synthetic rhynchophorinae pheromones in the laboratory. in laboratory tests, attraction of males and females in y-tube olfactometer to conspecific males was greater than to females and clean air. males and females ... | 2003 | 14503583 |
| imported longhorned weevil (coleoptera: curculionidae) injury to soybean: physiological response and injury guild-level economic injury levels. | the imported longhorned weevil, calomycterus setarius roelofs, is an occasional pest of soybean, glycine max (l.), and can cause substantial defoliation of seedling soybean when the weevil is present in large numbers. because weevil populations can reach high levels, the potential exists for significant seedling injury, so economic injury levels (eils) are needed for imported longhorned weevil on seedling soybean. because the bean leaf beetle, cerotoma trifurcata (forster), also is present on se ... | 2003 | 14503588 |
| pa1b, an insecticidal protein extracted from pea seeds (pisum sativum): 1h-2-d nmr study and molecular modeling. | pa1b (pea albumin 1, subunit b) is a 37-amino acid cysteine-rich plant defense protein isolated from pea seeds (pisum sativum). it induces short-term mortality in several pests, among which the cereal weevils sitophilus sp. (sitophilus oryzae, sitophilus granarius, and sitophilus zeamais) that are a major nuisance for stored cereals, all over the world. as such, pa1b is the first genuine protein phytotoxin specifically toxic to insects, which makes it a promising tool for seed weevil damage cont ... | 2003 | 14556622 |
| a weevil pollinating the canary islands date palm: between parasitism and mutualism. | palm pollination systems are highly diverse, including by wind and by several different groups of insects. many palm species are associated with more or less specific pollinating weevils that are also floral herbivores. for many such palms, the importance of these "palm flower weevils" as pollinators has not been examined. here we describe a new ex situ method of demonstrating insect pollination when pollinator exclusion is not possible. we show that neoderelomus piriformis beetles carry pollen ... | 2003 | 14564403 |
| biological activities of an extract from cleome viscosa l. (capparaceae). | electron micrograph examination of the leaf and stem surfaces of cleome viscosa l (family capparaceae) revealed the presence of secretory glandular trichomes with club-cylinder and cylinder morphologies. in the present study, the leaves and stems of c. viscosa were extracted with hexane and the extract was evaluated for the following biological activities: anti-bacterial, anti-fungal, contact insecticidal and nematicidal. the extract was found to be a potent anti-bacterial agent according to the ... | 2003 | 14564407 |
| host selection behaviour by adults of legume and cereal breeding populations of sitophilus oryzae (coleoptera: curculionidae). | 2003 | 14641985 | |
| ionizing irradiation quarantine treatment against plum curculio (coleoptera: curculionidae). | plum curculio, conotrachelus nenuphar (herbst), is a quarantine pest of many temperate fruits, such as pomes, malus spp.; stone fruits, prunus spp.; and blueberries, vaccinium spp.; in north america east of the rocky mountains and a small area in utah. there are two strains, a northern univoltine one that undergoes obligate diapause as an adult and a southern multivoltine strain that usually has facultative diapause. current quarantine treatments for shipment to areas that do not have the pest i ... | 2003 | 14650511 |
| resource use of insect seed predators during general flowering and seeding events in a bornean dipterocarp rain forest. | insect seed predators of 24 dipterocarp species (including the genera ot dipterocarpus, dryobalanops and shorea) and five species belonging to the moraceae, myrtaceae, celastraceae and sapotaceae were investigated. in a tropical lowland dipterocarp forest in sarawak, malaysia, these trees produces seeds irregularly by intensely during general flowering and seeding events in 1996 and/or 1998. dipterocarp seeds were preyed on by 51 insect species (11 families), which were roughly classified into t ... | 2003 | 14658448 |