Three sprays of certain different insecticides were carried out to evaluate
their efficiency against both pink bollworm Pectinophora gossypiella (Saund.) and the
spiny bollworM earias insulana (Boisd.) infesting cotton plants under (ield conditions
during 2000 and 2001 seasons. Tested insecticides were (eceiv d from three
chemical groups, 4 pyrethroids, 2 organophosphates and one carbamate. The two
organophosphales insecticides had the same active ingredient but differ in their
formulations. Tested pyrethroids were the most effective which induce the higtlest
%reductlon In bollworm~ laNse population during two seasons. fol/owed by
earba males then organophosphorus insecticides excepl Oursban ( P) was active
than carbamate during 2000 season, Results Indicated Ihal, overall mean percent of
reduction in population density of bollworms during 2001 was more cot)1pared to that
of 2000 season (or all treatments. The percanl reduction ranged between 42.98 to
77.78% and 59.20 10 83.00% for Bestan (OP) and Fenthrin (Pyreth.) du Ing 2000 and
2001 seasons, respecUlJely. Data Indicated that also two treatments Wilh the same
active ingredient of organophosphorus. Dursban induced higher reduction In
bollworms populations than with Be$ta".