Field experiments were carried out at Manzala district, Dakahlia Governorate during two successively seasons (2008 and 2009) to evaluate the release of egg parasitoid Trichogramma evanescens West. For controlling pink bollworm Pectinophora gossypiella ( Saund) and Spiny bollworm Earias insulana (Boisd) in cotton field. The results showed that the average percentages of infestation by pink and spiny bollworms throughout the whole 2008 season were 2.9% and 5.4% in Trichogramma release area and insecticides treated area respectively. In the second season of study the average percentages of infestation by pink and spiny bollworms throughout the whole season were 2.3% and 5.3% in Trichogramma release area and insecticides treated area respectively. The results revealed that, the average percentages reduction of infestation by the two insect pest were 53.91% in 2008 season and 56.88% in 2009 season. These percentages reduction were achieved due to T. evanescens release. The present results revealed that T. evanescens is a good tool for controlling pink and spiny bollworms in cotton fields.