Variation in the Susceptibility of Spodoptera litura (Fab)Populations to Various Synthetic Pyrethroids

摘要

The third instar larvae of Spodoptera litura obtained from Kapurthala were 20.74,15.46,12.9, 9.59 and 7.05 and 16.74,13.22,21.18,11.50 and 4.83-fold resistant to deltamethrin, alphacypermethrin, cypermethrin, β-cyfluthrin and fenvalerate, respectively, when applied by direct spray and leaf dip method, respectively, as compared to Delhi population. Regardless of method of application β-cyfluthrin was most effective against Delhi and Kapurthala population.