Residual efficacy of contact insecticides, applied on surfaces, against major stored-product insects

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Abstract: In the present study, we investigated the insecticidal efficacy of alpha-cypermethrin, pirimiphos-methyl, and spinosad against adults of the red flour beetle, Tribolium castaneum (Herbst), Coleoptera: Tenebrionidae), the cigarette beetle, Lasioderma serricorne (F.) (Coleoptera: Anobiidae), and the granary weevil, Sitophilus granarius (L.), Coleoptera: Curculionidae. Each insecticide was applied at the label dose on concrete, metal, plastic, and ceramic surfaces, with mortality levels recorded after 3, 7, 14, and 21 days of exposure. Residual efficacy was observed over a five-month period. Our results indicate that spinosad provides effective control against adults of the tested species. The type of surface did not significantly affect the insecticidal efficacy of the insecticides during the initial month of
testing. However, residual efficacy was influenced by both the surface material and the insect
species. Notably, in most cases, 100% mortality was recorded after 21 days of exposure.

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