Efficacy of Selected Insecticides on Brinjal Shoot and Fruit Borer and the Status of Natural Enemies with Respect to Them

Abstract

This study intended to find out the efficacy of insecticides on Brinjal Shoot and Fruit Borer (BSFB) and the effects of them on natural enemies in the brinjal field. Based on the questionnaire survey, five insecticides those were highly used by farmers were selected for this study. These five insecticides and an untreated control treatment were tested in the field by arranging them with seven replicates in a completely randomized design. Laboratory study was conducted to test the efficacy of insecticides on the larva of the BSFB. The presence of natural enemies were monitored in the field, two one day before and after the application of insecticide. Analysis was done by using SAS and compared with Duncan’s Multiple Range Test. Acetamiprid was effective in the laboratory study and Chlorpyrifos was found to be most applicable in the field. Ladybird beetles were most abundant and long lasting predators in the brinjal fields. Spiders and ants were having predatory activities in the field next to Ladybird beetles. The effect of Carbofuran on the predators of brinjal pests was very minimal. On the other hand, the activities of natural enemies were poor in the treatments of Chlorpyrifos and Acetamiprid while Carbofuran was least effective in the control of brinjal pests.