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The aim of this study was to evaluate the effect of the main pesticides registered for tomato cultivation on the parasitism of the egg parasitoid Trichogramma pretiosum. 29 fungicides and 30 insecticides were evaluated for their selectivity. The insecticides and fungicides were separated into toxicological classes according to the reduction in parasitism capacity, according to the scale proposed by members of the IOBC/WPRS.