The present work was carried out during the two successive seasons of 2000 and 2001 at Kafr El-Geraeyaa, Zagazig region, Sharkia Governorate to evaluate the effects af Chinmix, Spintor and Biorepel compounds against cotton bollworms (Pectinophera gossypiella arid Earias insulana) in cotton fields. The results showed that Chinniix, Spintor and Biorepel caused reduction in cotton bolls infestation by cotton bollworms (P. gassypiella and E. insulana). Chimnix was the most effective compound against cotton bollworms followed by Spintor and Biorepel showing annual reduction averages of 93.90, 6372 and 34.7l%; 94.31, 69.21 and 37.72 % in 2000 and 2001 seasons, respectively. Also the above-mentioned compounds caused significant reduction in the yield losses as compared to the control in both seasons. The use of these compounds may be an important factor in an integrated control program of bollworms.