Evaluation of insecticides against rice leaf folder, Cnaphalocrocis medinalis (Guenee)

Six insecticides viz., deltamethrin 2.8 EC @ 12.5 g a.i./ha, chlorpyriphos 20 EC @ 300 g a.i./ha, triazophos 40 EC @ 500 g a.i./ha, lambda cyhalothrin 5 EC @ 12.5 g a.i./ha, indoxacarb 14.5 SC @ 30 g a.i./ha and flubendiamide 39.35 SC @ 24 g a.i./ha and one bio pesticide, Bacillus thuringiensis var. kurstaki were evaluated against rice leaf folder. The data showed that the infestation of rice leaf folder was effectively checked by the spray of flubendiamide followed by lambda cyhalothrin, indoxacarb, triazophos, chlorpyriphos and deltamethrin. During the entire spray schedule in both the years, flubendiamide recorded maximum per cent reduction over control and was found to be most superior treatment, while Bt treated plots recorded least per cent reduction among the treatments.