Trichogramma evanescens Westwood (Hymenoptera: Trichogrammatidae) is used for biological control of European corn borer Ostrinia nubilais Hubner (Lepidoptera: Crambidae), one of the key pest of maize (Zea mays L.) (Poales: Poaceae) in Turkey. Considering other pests, there is a need for integration of chemical control and T. evanescens releases. Therefore, effects of chemical insecticides on T. evanescens should be known. In this study, effects of insecticides chlorpyrifos ethyl, indoxacarb, chlorantraniliprole, deltamethrin, lambda-cyhalothrin and novaluron on the preimaginal developmental stages of T. evanescens were investigated using egg card dipping method in laboratory conditions. Blue egg cards containing approximately 125 parasitised Ephestia kuehniella Zeller (Lepidoptera: Pyralidae) eggs were dipped into insecticide solutions prepared at the recommended dose for 5 second at each developmental stage of T. evanescens. Emergence ratio, parasitism capacity, emergence and sex ratio of offsprings were determined. Chlorpyrifos ethyl caused 100% death for all developmental stages and classified as harmful (4) according to the guidelines of IOBC. Deltamethrin and lambda-cyhalothrin was harmless (1) to emergence ratio, but caused reduction on the parasitism capacity (2) and the sex ratio of F-1. Novaluron was slightly harmful (2) when applied during the egg-larval period and harmless to F-1. Chlorantraniliprole and indoxacarb were harmless (1) for all developmental stages.