Field efficacy of different biorationals and insecticides against brinjal shoot and fruit borer (Leucinodes orbonalis Guenee) under terai region of West Bengal

Abstract

Field efficacy of seven insecticides, including biorationals, was evaluated against Leucinodes orbonalis (Guenee) at the teaching farm, Uttar Banga Krishi Viswavidyalaya, during the two consecutive rabi seasons of 2018–19 and 2019–20. The results showed that chlorantraniliprole 18.5 SC, flubendiamide 39.35 SC, and novaluron 5.25% + emamectin benzoate 0.9% SC were the most successful treatments resulted in the lowest shoot infestation (2.24-6.05%) and fruit infestation (number basis: 11.01-13.29% and weight basis: 11.94-15.75%). Bacillus thuringiensis var. kurstaki and chlorantraniliprole 18.5 SC both produced the highest commercial fruit yields, ranging from 13.54 to 14.54 t/ha and 14.11 to 14.51 t/ha, respectively. Azadirachtin 50,000 ppm was the least effective among the tested insecticides against brinjal shoot and fruit borer.