Releasing the egg parasitoid Trichogramma evanescens west. (Hymenoptera: Trichogrammatidae) in date palm orchards at El-bahria Oases Giza, Egypt, was evaluated as an eco-biological agent for suppression of date infestation with date palm insect pests. Results revealed a significant efficacy of this parasitoid for controlling lepidopterous insect pests of date palms. Releasing T. evanescens in the flowering season and emergence of spathes during the mid of March has a clear effect on the Arenipses sabella Hampson percent of infestation and reduced the infestation by 58.4%. While Releasing T. evanescens in the mid June has a great impact on the Deudorix livia Klugpercent of infestation with 85.5% of reduction. Percent of infestation of Batrachedra amydraula Meyrick and Coccotrypes dactyliperda Fabricius were also diminished by 72.6%, and 48.4%, respectively. Releasing T. evanescens wasps using two densities (one and two cards per tree) in date palm orchards resulted a reduction of date fruit infestation. The effect of releasing T. evanescens using two cards resulting a great reduction of Ephestia calidella Guenee infestation by 87.6%. While C. dactyliperda was reduced by 73.5%.The lowest mean percent of reduction was 58.4 found in the A. sabella infestation, which is actually a reasonable suppression for this important pest. While the highest mean percent of reduction was recorded 87.76 in E. calidella. Results revealed that the timing of release, parasitoid density and number of releases appear to be an important factors influencing the efficacy of the parasitoid action against the insect pests. Releasing the egg parasitoid T. evanescens in date palm orchards can play a great role and utilized as eco-biological agent to suppress lepidopterous insect pests and its infestation of dates and date palm trees in El-bahria oases, Giza, Egypt.