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impact of vairimorpha sp. (microsporidia: burnellidae) on trichogramma chilonis (hymenoptera, trichogrammatidae), a hymenopteran parasitoid of the cabbage moth, plutella xylostella (lepidoptera, yponomeutidae).a multi-generation mass breeding colony of the cabbage moth, plutella xylostella, was found to be infected with a microsporidium, vairimorpha sp., which is passed transovarially between generations. the microsporidian infection had little impact on the fitness of this lepidopteran pest. however, when trichogramma chilonis parasitized such infected host eggs, the offspring of this parasitoid species suffered from severe deficiencies. microsporidian spores, ingested by parasitoid larvae together w ...199910486223
acute toxicities and sublethal effects of some conventional insecticides on trichogramma chilonis (hymenoptera: trichogrammatidae).the acute toxicity of 10 conventional insecticides to adult of trichogramma chilonis ishii (hymenoptera: trichogrammatidae) was bioassayed by membrane method, and then their sublethal effects on the parasitoid were evaluated in the laboratory. based on sublethal concentration (lc30) values at 8 h after treatment, we determined that adult t. chilonis were the most susceptible to chlorfenapyr, followed by fipronil, spinosad, avermectins, beta-cypermethrin, and cartap, with lethal concentration (lc ...201222928293
the effects of temperature and host age on the fecundity of four trichogramma species, egg parasitoids of the cnaphalocrocis medinalis (lepidoptera: pyralidae).the cnaphalocrocis medinalis (guenée) is one of the most important rice pests in asia and is difficult to control by chemical insecticides due to its rapid development of resistance. to screen potential species for biological control of c. medinalis, we investigated the effects of temperature (20, 24, 28, 32, and 36‚ÄČ°c) and host age (1-, 2-, 3-, and 4-d-old) on the fecundity of four trichogramma spp. on c. medinalis eggs. our results indicated that c. medinalis eggs were acceptable to t. japonic ...201728398560
seasonal abundance of the parasitoid complex associated with the diamondback moth, plutella xylostella (lepidoptera: plutellidae) in hangzhou, china.an investigation of insect parasitoids of the diamondback moth, plutella xylostella (linnaeus), in brassica vegetable crops in the suburbs of hangzhou was conducted during five periods from 1989 to 1997. eight species of primary parasitoids were recorded: trichogramma chilonis ishii, cotesia plutellae kurdjumov, microplitis sp., oomyzus sokolowskii kurdjumov, diadromus collaris (gravenhorst), itoplectis naranyae (ashmead), exochus sp. and brachymeria excarinata gahan. seven species of hyperparas ...200010996863
side effects of bacillus thuringiensis var. kurstaki on the hymenopterous parasitic wasp trichogramma chilonis.most of the detrimental effects of using conventional insecticides to control crop pests are now well identified and are nowadays major arguments for replacing such compounds by the use of biological control agents. in this respect, the bacterium bacillus thuringiensis var. kurstaki and trichogramma (hymenoptera: trichogrammatidae) parasitic wasp species are both effective against lepidopterous pests and can actually be used concomitantly. in this work, we studied the potential side effects of b ...201626590060
olfactory responses of plutella xylostella natural enemies to host pheromone, larval frass, and green leaf cabbage volatiles.the parasitoids trichogramma chilonis (hymenoptera: trichogrammatidae) and cotesia plutellae (hymenoptera: braconidae), and the predator chrysoperla carnea (neuroptera: chrysopidae), are potential biological control agents for the diamondback moth, plutella xylostella (lepidoptera: yponomeutidae). we present studies on the interactions between these bioagents and various host-associated volatiles using a y olfactometer. t chilonis was attracted to a synthetic pheromone blend (z11-16:ald, z11-16: ...200211871395
physiological effects of resveratrol and coumaric acid on two major groundnut pests and their egg parasitoid behavior.groundnut, arachis hypogea l., is one of the plant species that synthesizes phenolic compounds, resveratrol and coumaric acid. they are induced as a defense strategy in plant in response to feeding lepidopterans. the present study investigated the role of resveratrol and coumaric acid in producing antiherbivore effects as a direct defense against two major groundnut pests, spodoptera litura f. and amsacta albistriga w., and in indirect defense by attracting the egg parasitoid trichogramma chilon ...201626890503
taiwanese trichogramma of asian corn borer: morphology, its-2 rdna characterization, and natural wolbachia infection.egg parasitoids of the genus trichogramma are natural enemies of many lepidopteran borers in agricultural areas around the world. it is important to identify the correct species and ideally focus on endemic trichogramma for pest control in particular crops. in this study, trichogramma wasps were collected from parasitized eggs of asian corn borer in southwestern taiwan. three trichogramma species, trichogramma ostriniae pang and chen, trichogramma chilonis ishii, and t. sp. y, were identified ba ...201626896674
parasitism and suitability of fertilized and nonfertilized eggs of the rice striped stem borer, chilo suppressalis (lepidoptera: crambidae), for trichogramma parasitoids.parasitoids can utilize the nutrition of host eggs to culture their own offsprings. host qualities, including size, age, and species, influence parasitism preference and fitness of the parasitoid offsprings. however, an interesting question here is whether the parasitoids have the ability of recognizing fertilized and nonfertilized host eggs. in this study, we investigated the performance of three indigenous trichogramma species (trichogramma japonicum ashmead, trichogramma dendrolimi matsumura, ...201626802170
evaluation for potential trichogramma (hymenoptera: trichogrammatidae) strains for control of the striped stem borer (lepidoptera: crambidae) in the greater mekong subregion.trichogramma species and strains differ significantly in host specificity and performance. nine trichogramma strains, six of them collected from paddy fields in the greater mekong subregion, were evaluated for performance on eggs of the striped stem borer, chilo suppressalis (walker), in both laboratory and field tests to determine potential trichogramma strains that can be used in an inundative release in an integrated pest management program. in the laboratory glass vial tests, all strains sho ...201425026653
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