Efficacy of spinosad, a reduced-risk bacterial insecticide, against nine major stored-product insects was evaluated in the laboratory by exposing 25 beetle adults or 50 eggs of moth species to 100 g of untreated wheat and wheat treated with 0.1, 0.5, and 1 mg (a.i.)/kg of spinosad. The following insect species were tested: the lesser grain borer, Rhyzopertha dominica (F.); rusty grain beetle, Crytolestes ferrugineus (Stephens); red flour beetle, Tribolium castaneum (Herbst); confused flour beetle, T. confusum Jacquelin du Val; rice weevil, Sitophilus oryzae (L.); maize weevil, S. zeamais Motschulsky; Indianmeal moth, Plodia interpunctella (H¨ıber); almond moth, Cadra cautella (Walker); and Angoumois grain moth, Sitotroga cerealella (Olivier). Spinosad at 0.5 or 1 mg/kg on white wheat was very effective against all species except the red flour beetle and confused flour beetle. Spinosad appears to be a viable alternative to currently used grain protectants for managing insects in stored hard white winter wheat.
Species 1: Coleoptera
Species 2: Lepidoptera
Keywords: Stored-Product Insects, Spinosad
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