The effect of different concentrations of tested fungicides and/ or Trichoderma spp. were investigated against the main soil borne pa­thogens of maize and soybean such as: Fusarium spp. Rhizoctonia solani, Caphalosporium spp. and Macrophomina phaseli under laboratory, green­house and field conditions. Field experiments were carried out for two successive seasons. Results indicated that Homai 80 was the most ef­fective fungicide followed by Ben late 50% and Vitavax thiram, while Monceren 25% was the least effective in all cases. T.viride was the most antagonistic fungus against the main pa­thogens under laboratory conditions. Soil treatment with Trichoderma spp. under ced greenhouse and/or field conditions led to a significant re­duction in damping-on and increased the survival plants.