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Sensitivity of polyphagous(Plodia interpunctella)and stenophagous(Ephestia kuehniella)storage moths to residual insecticides:effect of formulation and larval age

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Insect Science 2021年第6期28卷 1734-1744页

作者： vaclav stejskal Jitka Stara Stano Pekar Marta Nesvorna Jan Hubert Crop Research Institute PragueCzechia Faculty of Science Department of Botany and ZoologyMasaryk UniversityBrnoCzechia Faculty of Agrobiology Food and Natural ResourcesCzech University of Life SciencesPragueCzechia

Pyralid moths,Ephestia kuehniella and Plodia interpunctella,are prevalent stored product *** insecticides are the main tool to control these moths in the *** data describing the response of these moths to insecticides are *** lethal effect of the organophosphate,pyrethroid,and halogenated-pyrrole on moths larvae were compared in laboratory *** hypothesis was that the very polyphagous ***-punctella would have generally higher insecticide tolerance than that of the stenophagous *** insecticide concentrations were applied onto the inner surface of glass tube *** larvae of 14 or 21 d old of *** and 7 or 14 d old of *** were used by *** larval mortality was checked after 24 h of *** mortality was significantly influenced by age of larvae and the groups of *** differences among the efficacies of the tested formulations with identical active compounds were found,except significant different mortality of *** on deltamethrin formulations.A comparison of analytical standards showed that *** was less susceptible to the active ingredient pirimiphos-methyl than ***,while *** was less susceptible to deltamethrin than *** differences between the two species were observed for *** therefore rejected the hypothesis that polyphagy/stenophagy can be a general predictor of insecticide tolerance in the two tested storage *** most important finding for effective use was that the young larvae of both species were more susceptible to tested insecticides than older larvae.

关键词： efficacy integrated pest management IRAC pesticides Pyralidae residual

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Differential levels of mite infestation of wheat and barley in Czech grain stores

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Insect Science 2009年第3期16卷 255-262页

作者： Jan Hubert Zuzana Kucerova Radek Aulicky Marta Nesvorna vaclav stejskal Crop Research Institute Prague Czech Republic

While mites are able to utilize numerous food sources, the suitability of the food strongly influences population growth. The different suitabilities of various stored agricultural products will thus affect the level of infestation. In this study, we compared field mite infestation rates in two stored cereals： wheat and barley. We analyzed mite abundance, frequency and species composition in samples of grain obtained from 79 selected Czech grain stores. Stored barley seemed to be more vulnerable to mite attack than wheat, as we consistently found more infested samples, more species and higher mean and median mite abundance per sample in barley as compared to wheat. The mean mite abundance per sam- ple were 55 and 506 individuals for wheat and barley, respectively. In barley, 10% of sampies exceeded allergen risk threshold （i.e., 1 000 individuals per kg of grain）. Altogether, 25 species were identified from approximately 35 000 individuals. The most frequently identified species were the same in wheat and barley, that is, Tydeus interruptus Sig Thor, Acarus siro L., Tarsonemus granarius Lindquist, Lepidoglyphus destructor （Schrank） and Tyrophagus putrescentiae （Schrank）. Based on principal components analysis, we found a closer association of T. interruptus, T. putrescentiae, L. destructor and Cheyletus eruditus （Schrank） with barley samples, corresponding to the high frequency and abundance values of these mites. The probable reasons for the higher infestation, especially mite abundance in barley, are discussed in relation to the higher proportion of crushed parts, which may release favorable nutrient sources and amplify the abundance values.

关键词： barley food grain mite storage wheat

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