| 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 |
| a test of the reserve meristem hypothesis using verbascum thapsus (scrophulariaceae). | the reserve meristem hypothesis predicts that latent meristems may act as a bet-hedging strategy given high-cost, predictable herbivory. under this hypothesis, damage to a plant should elicit greater branching. this prediction was tested in verbascum thapsus with three experiments manipulating the intensity and type of damage to reproductive tissue. in the first experiment, seed set was prevented in the treatment group by stigma excision and lanolin application to 80% of the flowers of each plan ... | 2000 | 11118415 |
| development of teratocytes associated with microctonus aethiopoides loan (hymenoptera: braconidae) in natural and novel host species. | a laboratory study investigated development of teratocytes derived from the parasitoid microctonus aethiopoides loan in the natural host, sitona discoideus gyllenhal, and in three novel hosts, the introduced weed biological control agent rhinocyllus conicus (froehlich), and two new zealand native species nicaeana cervina broun and irenimus stolidus broun. weevils were exposed to parasitoids and then examined 6, 10 and 15 days post-parasitism for parasitoid stage and size, and teratocyte number a ... | 2001 | 11119771 |
| effect of some ghanaian plant components on control of two stored-product insect pests of cereals. | in an attempt to find natural and cheaper methods for the control of stored-product pests of cereals, some traditionally useful ghanaian plant materials were evaluated. hexane+isopropyl alcohol extract of leaves of ocimum viride proved most effective in the control of tribolium castaneum (coleoptera: tenebrionidae) and sitophilus oryzae (coleoptera: curculionidae), followed by that of chromolaena odorata. o. viride showed strong repellent activity and thus deterred the insects from feeding. it r ... | 2000 | 11124372 |
| 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 |
| effect of essential oils from leaves of ageratum conyzoides, lantana camara and chromolaena odorata on the mortality of sitophilus zeamais (coleoptera, curculionidae). | ageratum conyzoides, chromolaena odorata, and lantana camara, are common weed species in cameroon. essential oil extracts from their leaves were tested for efficacy on the morality of the maize grain weevil, sitophilus zeamais (coleoptera, curculionidae). concentrations of the essential oils relative to the maize grains of 0.013, 0.025, 0.05 and 0.1% (v/w) were used for a. conyzoides and 0.063, 0.125, 0.25 and 0.50% (v/w) for c. odorata and l. camara. twenty 7-day old adult weevils were fed on m ... | 2001 | 11124374 |
| evolutionary assembly of the conifer fauna: distinguishing ancient from recent associations in bark beetles. | several shifts from ancestral conifer feeding to angiosperm feeding have been implicated in the unparalleled diversification of beetle species. the single largest angiosperm-feeding beetle clade occurs in the weevils, and comprises the family curculionidae and relatives. most authorities confidently place the bark beetles (scolytidae) within this radiation of angiosperm feeders. however, some clues indicate that the association between conifers and some scolytids, particularly in the tribe tomic ... | 2000 | 11133024 |
| dispersal of the cotton boll weevil (coleoptera: curculionidae) in south america: evidence of rapd analysis. | rapd technique provides useful information on the geographic origin and dispersal of the boll weevil anthonomus grandis in south america. nine populations from argentina, brazil, paraguay, mexico and usa were analyzed. weevils were captured on native plants (misiones province, argentina) and on cotton cultures, except the sample from the united states (usda laboratory-reared colony). a sample of the 'peruvian square weevil', a. vestitus, from ecuador, was included in the analysis in order to com ... | 2000 | 11138940 |
| mass rearing the weevil hylobius transversovittatus (coleoptera: curculionidae), biological control agent of lythrum salicaria, on semiartificial diet. | lythrum salicaria l., purple loosestrife, an invasive eurasian perennial, is degrading wetlands across temperate north america. chemical, physical, and mechanical methods failed to provide long-term control. therefore, four host-specific insect species (two leaf feeders, a root feeder, and a flower feeder) were introduced as biological control agents. to increase the availability of adults of the root feeding weevil hylobius transversovittatus goeze for field releases, we developed a semiartific ... | 2000 | 11142294 |
| 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 |
| evaluation of sequential sampling plans for the larger grain borer (coleoptera: bostrichidae) and the maize weevil (coleoptera: curculionidae) and of visual grain assessment in west africa. | repeated sampling of rural maize stores in benin was conducted to evaluate published parameters of a sequential sampling plan for a negative binomial distribution to determine pest status for prostephanus truncatus (horn) and sitophilus zeamais motschulsky. a computer program was used to rerandomize the data and evaluate the effects, in terms of average sample number and error rates, of different sampling plan parameter values. with respect to p. truncatus, lower and upper thresholds of 0.2 and ... | 2000 | 11142318 |
| 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 |
| impacts of chipping on surrogates for the longhorned beetle anoplophora glabripennis (coleoptera: cerambycidae) in logs. | as part of the eradication program for recent introductions of the longhorned beetle anoplophora glabripennis (motschulsky) in the united states, wood from infested trees is chipped and incinerated. two tests were conducted to evaluate the efficiency of chipping wood from infested trees on the survival of the beetle. in the first test, plastic worms were used as surrogates for larvae of the beetle. plastic worms of different sizes were placed in holes drilled in logs of sugar maple, acer sacchar ... | 2000 | 11142319 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| [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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| effective biological control of salvinia molesta in the senegal river by means of the weevil cyrtobagous salviniae. | the invasion of salvinia molesta in the lower senegal river delta in mauritania and senegal in 1999 posed a serious threat to the socioeconomic conditions of the local people as well as to wetland biodiversity. eventually, an effective biological control of s. molesta was obtained by means of the weevil cyrtobagous salviniae, which was introduced in the river in senegal and mauritania in may 2000 and in senegal in april 2001. in october 2001, it became apparent that the weevils were doing a magn ... | 2003 | 14703904 |
| endosymbiont phylogenesis in the dryophthoridae weevils: evidence for bacterial replacement. | intracellular symbiosis is widespread in the insect world where it plays an important role in evolution and adaptation. the weevil family dryophthoridae (curculionoidea) is of particular interest in intracellular symbiosis evolution with regard to the great economical and ecological features of these invasive insects, and the potential for comparative studies across a wide range of host plants and environments. here, we have analyzed the intracellular symbiotic bacteria of 19 dryophthoridae spec ... | 2004 | 14739242 |
| [certain considerations on two cases of dermatitis caused by chickpea weevils]. | | 1951 | 14914658 |
| [experimental infection of body lice and grain weevils with rickettsia conori (tick fever)]. | | 1952 | 14943609 |
| 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 |
| boll weevil (coleoptera: curculionidae) bait sticks: toxicity and malathion content. | assays of malathion content and toxicity to boll weevil, anthonomus grandis grandis bohemian, were conducted on boll weevil bait sticks, now marketed as boll weevil attract and control tubes (bwacts; plato industries, houston, tx). in general, the longer bwacts were in the field, the lower the mortality of weevils that were exposed to them. bioassays of weevil mortality correlated with hexane washes of bwact surfaces showed highly variable mortality when surface malathion fell below approximatel ... | 2003 | 14994795 |
| early-season colonization patterns of the boll weevil (coleoptera: curculionidae) in central texas cotton. | it is commonly believed that colonization of early-season cotton, gossypium hirsutum l., by overwintered boll weevils, anthonomus grandis grandis boheman, is concentrated on field margins. however, supporting experimental evidence is not available. in 1999 and 2000, we examined colonization patterns of overwintered boll weevils in central texas cotton on the bases of adult collections by a pneumatic sampler and hand collections of abscised infested squares. samples were taken from sites arranged ... | 2003 | 14994797 |
| evaluation of kill strips on boll weevil (coleoptera: curculionidae) mortality in pheromone traps and impact on weevil escape. | a field study examined the temporal patterns of boll weevil mortality provided by two commercially available kill strips, hercon vaportape ii and plato insecticide strip, and to evaluate the impacts of these devices on weevil escape from traps. both types of kill strips produced similar levels of weevil mortality with the exception of the last two inspection intervals (30 and 46 h after continual exposure to kill strips). at these intervals, the plato strip produced significantly higher mortalit ... | 2003 | 14994800 |
| 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 |
| temporal dynamics of otiorhynchus schlaeflini (coleoptera: curculionidae) adults and damage assessment on two wine grape cultivars. | the nocturnal temporal dynamics of adults of otiorhynchus schlaeflini stierlin on wine grape vitis vinifelra l. 'rhoditis' and 'mavroudi' were studied in the western peloponnese during spring 1993 and 1994. the maximum number of adults was recorded approximately 3 h after sunset. emergence began on 13 march 1993 and 19 march 1994; the population peaked on 24 and 16 april in each year, respectively. low numbers of adults were found during daytime observations in may. the length and the number of ... | 2004 | 15002401 |
| 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 |
| effects of burial and soil condition on postharvest mortality of boll weevils (coleoptera: curculionidae) in fallen cotton fruit. | effects of soil condition and burial on boll weevil, anthonomus grandis grandis boheman, mortality in fallen cotton, gossypium hirsutum l., fruit were assessed in this study. during hot weather immediately after summer harvest operations in the lower rio grande valley of texas, burial of infested fruit in conventionally tilled field plots permitted significantly greater survival of weevils than in no-tillage plots. burial of infested squares protected developing weevils from heat and desiccation ... | 2004 | 15154462 |
| deterrent effects of four neem-based formulations on gravid female boll weevil (coleoptera: curculionidae) feeding and oviposition on cotton squares. | three commercial neem-based insecticides, agroneem, ecozin, and neemix, and a neem seed extract formulation, bitters, containing 1,036, 16,506, 471, and 223 microg/ml azadirachtin, respectively, were assessed for feeding and oviposition deterrence against gravid female boll weevils, anthonomus grandis grandis boheman, in the laboratory. in choice assays, excised cotton squares dipped in the separate formulations were first physically contacted by the weevils' tarsi or antennae fewer times than n ... | 2004 | 15154463 |
| 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 |
| 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 |
| allozyme markers to help define the south american origins of microctonus hyperodae (hymenoptera: braconidae) established in new zealand for biological control of argentine stem weevil. | the thelytokous parasitoid, microctonus hyperodae loan, was collected from eight south american locations and introduced to new zealand in 1991 for biological control of argentine stem weevil, listronotus bonariensis (kuschel) (coleoptera: curculionidae). parasitoids from each population were released in equal numbers at each new zealand site to give them the same opportunities to establish. population markers have been sought to identify the south american geographic populations that have becom ... | 2004 | 15191624 |
| 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 |