EFFICACY OF Bacillus thuringiensis VAR. KURSTAKI (DIPEL 2X), NEEM EXTRACT AND CHLORPYRIFIOS-METHYL (RELDAN) AGAINST COTTON BOLLWORMS

Abstract

The efficacy of Bacillus thuringensis subsp. Kurstaki (Dipel 2X), neem extract (Azadirachtin) and reldan (Chlorpyrifios-methyl) for management of cotton bullworms (Earias insulana "Boisd" and Pectinophora gossypiella "Saunders") were studied under field condition at Shubrakheit region, Behira Governorate during 2004-2005. Dipel 2X (200 g/Fed.) was equally effective as the chemical insecticide (Reldan) to protecting the fruiting flowers and green bolls of the cotton variety "Giza 88". Neem extract was less effective than Dipel 2X compared with untreated control. The highest yield of cotton was obtained by using the chemical insecticide treatment followed by Dipel 2X and neem extract compared with untreated control. Dipel 2X persisted well under the field conditions with identical half life time of 10 days in cotton fields compared to Reldan and neem extract.