Observed potentiation between pyrethroid and organophosphorus insecticides for the management of Spodoptera litura (Lepidoptera: Noctuidae)

Mixtures of pyrethroids plus organophosphates were assessed for their potentiation in resistant field populations of Spodoptera litura from Pakistan by using a leaf-dip bioassay method. Cypermethrin, alphacypermethrin, bifenthrin, deltamethrin, and cyfluthrin exhibited potentiation by ethion. Mixtures of deltamethrin + triazophos and cyfluthrin + methamidophos also showed potentiation. Cypermethrin in combination with profenofos or chlorpyrifos produced an antagonism.