Comparative efficacy of certain bio-rational insecticides and Bacillus thuringiensis based bio-insecticides against Leucinodes orbonalis Guen. in brinjal

Abstract

Field trails were laid out during two rabi seasons 2007-08 and 2008-09 with F1 brinjal hybrid Anamika to investigate the comparative efficacy of new introduced insecticidal molecules and Bt formulations against shoot and fruit borer, Leucinodes orbonalis Guen. in brinjal under terai conditions. The studies revealed that indoxacarb 14.5% SC to be the most effective treatment against the pest and it was at par with spinosad, emamectin benzoate, diafenthiuron, endosulfan and halt during both the years. The maximum shoot and fruit damage was found in delfin treated plots, i.e. 11.09 and 13.17 per cent, respectively while in the control was 25.78 and 33.43 per cent respectively. The fruit yield recorded during the study revealed that indoxacarb received higher fruit yield, i.e. 232.51 q/ha and per cent increase over control (57.94%), which was superior over all other treatments. Amongst Bt formulations, halt treated plots obtained maximum fruit yield (207.52 q/ha) while delfin treatment recorded minimum fruit yield (192.54 q/ha), but it was significantly higher to untreated control during both the years of study. The investigation revealed that there was consistency in effectiveness and yield increase potential of various insecticidal and Bt formulation treatments during both the experimental years.