COMPARATIVE EFFICACY AND ECONOMICS OF SYNTHETIC AND BOTANICAL INSECTICIDES FOR THE MANAGEMENT OF STEM FLY, THRIPS AND WHITE FLY OF MUNGBEAN

Abstract

The study was conducted at Bangladesh Agricultural Research Institute (BAR) farm during March 2005 to August 2005 to find out the most appropriate management practices against three major insect pests of mungbean. The experiment consisted of seven treatments of various management practices viz. i) Seed treatment by Furadan 56 ( Carbofuran) (ä) 4% before sowing ii) Seed treatment by Cruisar 70 WS (Imidacloprid) before sowing iii) spraying of Nccm seed oil (1. 10 ml of water + 'frix 44 5 milL of water at 20 DAS and following spray at an interval of 10 days and continued up to the maturity of the crop iv) Spraying of Cymbush 10 EC ( Cypermethrin) d!I milL of water at 20DAS and at 35 DAS v) Spraying of Ekalux 25 EC (Quinalphos) 4 2 milL of water at 20DAS and at 35 DAS vi) Spraying of Shobicorm 425 [C (Propenphos + Cypermcthrin) @20 mIlL of water at 200AS and at 35 DAS and vii) Untreated (Control). The experiment was laid out in Randomized Complete Block Design (RCBD) with four replications. The stem fly. trips and white fly were tbund to attack mungbean fIeld. The highest stem tunneling (22.52 %) was recorded from the untreated control and lowest (14.50 %) from the application of Furadan 5(1 (Carbofuran) 4% before sowing. The highest reduction of infestation in case of stem tunneling by stem fly over control was recorded from application of Furadan 56 (Carbofuran) (Ô. 4% before sowing. The lowest number of whitctly (1.95 white fly/5 leaves) was recorded from application of Furadan 56 which also ensured the highest population reduction of 62.87% over control followed by Shobicorm 425 EC treatments (2.02 whitelly/5 leaves) which was equivalent to a reduction of 61.53 % successively over control. Spraying of Shobicorm 425 [C 20 mIlL of water at 20DAS and at 35 DAS (57.92%) treatment had the lowest number of thrips (2.5 per 5 leaves) where as the highest number of thrips (5.2 per 5 leaves) was recorded from untreated control.