EFFICIENCY OF INSECTICIDE ,BIOCIDE AND RELEASE OF Trichograma evanescens WEST WOOD IN REDUCING COTTON BOLLWORMS INFESTATION AT KAFR EL-SHEIKH.

This study was carried out at the Farm of Sakha Agricultural Research Station, Kafr El-Sheikh governorate during three successive seasons; 2008, 2009 and 2010 for assessing some agents for controlling the cotton bollworms, Pectinophora gossypiella (Saund.) and Earias insulana (Boisd.) Result showed that the most efficient insecticide against P. gossypiella larvae was sumi-alpha withe reduction 80.9, 78.7 and 79.9% in the first spray while in the second spray the reduction were 82.1, 85.2 and 83.7% in the three seasons of study, 2008, 2009, 2010 respectively Biovar and protecto were the least effective compounds in controlling this pest. As for Earias insulana larval population took almost the same trend with sumi-alpha while biovar and protecto were the least effective. Releasing trichograma evanescence West wood in two waves gave reduction for P. gossypiella and Earias insulana larvae with ranges of 31.7- 44.8 and 23.3 -36.7 % respectively .