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A local strain of Trichogrammaminutum (Riley) (Hymenoptera: Trichogrammatidae)was mass produced and released weekly in 0.25 ha plots of four commercial apple orchards to evaluate the level of parasitism in sentinel eggs masses of the obliquebandedleafroller (OBLR), Choristoneurarosaceana (Harris)(Lepidoptera:Tortricidae).Sentinel eggs were attached to the foliage either on release tree or at mid-distance between two release trees and were renewed every 3-4 days.Other sentinel eggs were also placed in adjacent plots (approx.20 m away from the release plots).