Abstract: The standard methods of IOBC/WPRS were followed to test Vertimic at 1.47 μL, 0.735 μL, Dimethoate at 25.00 μL, 12.50 μL, 6.25 μL, Kumulus at 0.675 μL, 0.336 μL and Touchdown at 156.00 μL, 78.00 μL, 39.00 μL for their side-effects on Trichogramma cacoeciae Marchal. The adult parasites were exposed to fresh pesticide residues. The control was sprayed with tap water. The results showed that these chemicals differed markedly in their toxicity. Among the tested pesticides, Dimethoate at 25.00 μL, 12.50 μL and 6.25 μL gave total mortality of the parasite compared to water treated control. It reduced the parasitism by 100 percent. Hence, categorized as harmful. Vertimic at 1.47 μL was slightly harmful with 57.37% reduction in parasitism. The remaining pesticides, Vertimic at 0.735 μL, Kumulus at 0.675 μL, 0.336 μL, Touchdown at 156.00 μL, 78.00 μL, 39.00 μL were harmless and did not differ with water treated control. These are more suitable for the use in Integrated Pest Management (IPM).