Bio-efficacy of synthetic insecticide and bio-pesticide for the management of shoot borer and fruit borers of okra

Abstract

Bio-efficacy of five synthetic insecticides (Permethrin 25EC, Emamectin benzoate 5 SG, Fenpropathrin 30 EC, Pyriproxifen 5EC, Fenvalerate 20EC), one bio-agent (Trichogramma chilonis Ishii) and one bio-pesticide (Ha NPV) was evaluated against the shoot borer and fruit borers of okra. All the treatments were superior over control in terms of mean shoot damage and fruit damage. Among the synthetic chemical pesticides two applications of emamectin benzoate 5 SG (200g/ha) was most effective with mean shoot damage of 9.91 per cent, while the least effective treatment was fenvalerate 20 EC (375 ml/ha) with mean shoot damage of 19.11 per cent. Similarly, against fruit borers emamectin benzoate 5 SG (200g/ha) was most effective with 12.51 per cent fruit damage; whereas, the least effective treatment was permethrin 25 EC (500ml/ha) with mean fruit damage of 19.11 per cent. The bio- agent Trichogramma chilonis Ishii released at the rate of 1.0 lac per hectare followed by the bio-pesticide HaNPV [250 LE/ha] after 10 days was more effective than untreated control.