Mycoparasitic play a vital role in biological control and IPM. Trichoderma harzianum has the potential to control a large number of plant pathogenic fungi. Application Trichoderma harzianum in IPM require knowing the potential effect resulted from combination with chemical pesticides, so, the study test the mixabilities of common chemical pesticides with T. harzianum radial growth, sporulation and biomass production of the fungus at 0.1, 0.5 and 1 of recommended dose (RD) concentrations. Based on comparison between the tested insecticides on mycelial growth, T. harzianum showed profuse mycelial growth with etoxazole followed by teflubenzuron, while, profenofos caused complete inhibition. On the other hand, the tested fungicides showed that penconazole was the most toxic fungicide inhibited completely the mycelial growth with all tested concentrations, while, copper oxychloride+metalaxyl cause the same effect on the two higher concentrations. Finally, the tested herbicides showed that glyphosate isopropylammonium and bentazone inhibited completely the mycelial growth of T. harzianum at 1 RD, while, lower two concentrations caused a middle inhibition effect. The best sporulation results were obtained from etoxazole, bentazone, teflubenzuron and diniconazole, to surpass the control, while, the rest of the pesticides either significantly reduced or prevent sporulation completely. Based on mycelial dry weight, bentazone surpassed the control. The study recommends mixing T. harzianum with diniconazole, etoxazole, teflubenzuron and bentazone, respectively. Whereas, penconazole and profenofos are completely in compatible with T. harzianum but the rest of tested pesticides has antisporulant effect and mycelial growth inhibition was high and depend on exposure concentration.