Status of Insecticide Resistance in Spodoptera litura in Andhra Pradesh, India

✍ Scribed by Armes, Nigel J.; Wightman, John A.; Jadhav, Deepak R.; Ranga Rao, Gangavalli V.

• Book ID: 101216425
• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 281 KB
• Volume: 50
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(199707)50:3<240::aid-ps579>3.0.co;2-9

✦ Synopsis

Twenty-two strains of the tobacco caterpillar, Spodoptera litura (F.) (Lepidoptera : Noctuidae), collected from groundnut crops of eight locations in Andhra Pradesh, India, between 1991 and 1996 were assayed in the F1 generation for resistance to commonly used insecticides. Resistance levels ranged as follows : cypermethrin, 0É2-to 197-fold ; fenvalerate, 8-to 121-fold ; endosulfan, 1to 13-fold ; quinalphos, 1-to 29-fold ; monocrotophos, 2-to 362-fold and methomyl, 0É7-to 19-fold. In nearly all strains pre-treatment with the metabolic inhibitor, piperonyl butoxide, resulted in complete suppression of cypermethrin resistance (2-to 121-fold synergism), indicating that enhanced detoxiÐcation by microsomal P450-dependent monooxygenases was probably the major mechanism of pyrethroid resistance. Pre-treatment with the synergist DEF, an inhibitor of esterases and the glutathione S-transferase system, resulted in a 2-to 3-fold synergism with monocrotophos indicating that esterases and possibly glutathione S-transferases were at least to some extent contributing to organophosphate resistance.