Bio-efficacy of newer insecticides against lepidopteron pests in castor (Ricinus communis L.)

Abstract

Field experiments were conducted during Kharif 2018-19 to evaluate the efficacy of different insecticides against major lepidopteran pests of castor revealed that all the treatments were found significantly superior over untreated control in reducing pest population. The results the newer insecticides were in general, superior over the untreated check in reducing the larval population. Among the tested treatments, efficacy of the treatments viz., chlorantraniliprole 18.5 SC and flubendiamide 480 SC were superior and followed by spinosad 45 SC and indoxacarb 15.80 EC which were found to be effective for all lepidopteran pests of castor. Considering the cost-effectiveness of various treatments, the maximum cost-benefit ratio (1:3.08) was registered in lambda cyhalothrin 2.5 EC with yield of 10.83 q / ha followed by flubendiamide 480 SC with C:B ratio of 1:3.06 and chlorantraniliprole 18.50 SC with C:B ratio of 1:3.05 as well yield of 13.10 q / ha and 13.8 q / ha, respectively.