Efficacy of Biorational and Conventional Insecticides against the Pepper Weevil, Anthonomus eugenii Cano (Coleoptera: Curculionidae) in the South-Central Chihuahua

We evaluated the efficacy of the biorational insecticides azadirachtin and spinetoram, as well as the neonicotinoid thiametoxam, the organophosphates chlorpyrifos and malathion, and the pyrethroid lambda-cyhalothrin against the pepper weevil, Anthonomus eugenii Cano, in a field of jalapeno pepper, Capsicum annuum L., in South-Central Chihuahua. Thiametoxam and chlorpyrifos had an impact on the reduction of this pest as many as five days after application. Also, we evaluated the insecticide rotation effect of Treatment 1 (spinetoram -> chlorpyrifos -> chlorpyrifos -> thiametoxam) and Treatment 2 (thiametoxam -> chlorpyrifos -> chlorpyrifos -> thiametoxam) where both treatments suppressed populations of this insect. Treatment 1 had the fewest fallen fruits.