Compatibility Studies of Fungicides with Combination of TrichodermaSpecies under In vitro Conditions

Fungicides viz., curzate and sancozeb were used at different concentrations that is., 100, 200, 400, 600, 800 and 1000 ppm active ingredient to evaluate Trichoderma species viz., Trichoderma harzianum (AUT1) and Trichoderma viride (AUT2) in favour of tolerance to fungicides. By increasing the fungicide concentrations to 400 ppm (sancozeb) and 600 ppm (curzate), the Trichoderma species tolerate the fungicides 50% and slightly incompatible at higher concentrations of 800 and 1000 ppm, and completely inhibited beyond 1000 ppm compared to the control for both fungicides. The highest 97.8% was recorded at 100 ppm for curzate fungicides when combined with AUT2 and 96.7% of compatibility was recorded at concentration of 100 ppm when AUT1 is combined with the same fungicides. But, in the case of sancozeb the highest compatibility (97.8%) was recorded when combined AUT2, and 95.5% with AUT1 at 100 ppm. Therefore, the present compatibility study assist in the selection of bio control agents, which can be used with reduced am``ount of preferred fungicides for the control of plant pathogenic fungi.