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Assessing effects of esfenvalerate aerosol applications on resident populations of Tribolium castaneum (Herbst), the red flour beetle, through direct and indirect sampling

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Small-scale field sheds were infested to establish resident populations of the red flour beetle, Tribolium castaneum (Herbst), and either left untreated or treated every two or four weeks with an aerosol spray of esfenvalerate (Conquer ®). Prior to treatments, sheds were infested by placing flour (food) patches underneath shelves in the shed, and two trials were done in separate blocks. Aerosol efficacy was assessed using pheromone traps to estimate live adults (indirect sampling) and by collecting dead adults and estimation of eggs, larvae, pupae, and adults in the food patches (direct sampling). Beetle populations readily colonized the food patches, and overall populations of each life stage in the food patches were similar in the controls and in the 2- and 4-week aerosol treatments. However, the proportion of individuals in the egg and larval stages was greater in the control versus the aerosol treatments. There were more live adults trapped in the controls than in the aerosol treatments, with lower adult numbers in the two-week aerosol spray than in the four-week sprays, and more dead adults in the food patches in the control and 4-week spray than in the 2-week spray. There were more adults in the pheromone traps in the untreated controls relative to the aerosol treatments, with more in the four-week than in the two-week aerosol treatment. Indirect sampling using pheromone traps gave consistent indications of aerosol efficacy, regardless of the extent of food patch colonization, however; the presence of the food patches allowed continued population development, and as a result the frequency of aerosol application had little impact on overall populations in the food patches.
F. H. Arthur , J. F. Campbell , E. A. Fontenot , M. D. Toews
Tribolium castaneum , adults , aerosols , eggs , esfenvalerate , flour , food processing , imagos , insect control , larvae , ova , pesticide application , pheromone traps , pupae , sampling , sheds , storage insects , trapping
Journal of stored products research 2013 v.53
Journal Articles, USDA Authors, Peer-Reviewed
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