Field efficacy of certain insecticides against shoot and fruit borer (Earias vittella Fab.) on rainy season okra in Prayagraj (U.P.)

Abstract

The present investigation was conducted during July to November 2018 at Central Research Farm, SHUATS, Naini, Prayagraj. The occurrence of shoot and fruit borer commenced from August third week with an average population of 2.69% infestation. The shoot and fruit borer, Earias vittella population increased and gradually reached its peak level of infestation 48.61% in October second week there after declined trend was observed as temperature decreased. It was found that shoots and fruit borer population increased with increasing maximum temperature and positively correlated with maximum temperature. Two applications of seven insecticides viz; Flubendiamide 39.35 SC (0.01%), Chlorantraniliprole 20 SC (0.006%), Cypermethrin 25 EC (0.006%), Spinosad 45 SC (0.005%), Indoxacarb 14.5 SC (0.01%), Fipronil 5 SC (0.005%) and Imidacloprid 17.8 SL (0.004%) were evaluated against shoot and fruit borer, Earias vittella. Minimum percent of shoot infestation, percent fruit infestation and B:C ratio were observed in Chlorantraniliprole with (2.77%, 4.97% and 1:3.13) respectively which was followed by Flubendiamide (3.94%, 6.44% and1:2.64) < Spinosad (6.79%, 7.68% and 1:3.08) < Indoxacarb (7.02%, 12.12%, and 1:2.26) < Cypermethrin (9.81%, 15.21%, and 1:2.50) Fipronil (10.76%, 17.98% and 1:2.52) < Imidacloprid (11.31%, 19.46% and1:2.72) < untreated control(water spray) (16.68%, 43.29% and 1:1.65) respectively.