Effects of two biological agents Trichoderma harzianum and T. viride in control of gray mold disease in tomato and eggplant under greenhouse condition

Abstract

Results indicated that using tests of double culture between B. cinerea and isolates of bioagents Trichoderma harzianum and T. viride showed that most isolates effect was T. harzianum (T1, Bioconte), In inhibition the pathogen. Results also revealed that the volatile substances for same isolates of T. harzianum and T. viride achieved the (T1, Bioconte) highest inhibition rate against B. cinerea which reached 77%. Also resulted demonstrated that both bio control agents T. harzianum (A1), T. viride (A2), achieved a reduction in the rate of infection and severity of gray mold infection on tomato (wijdan variety )and eggplant (Barcelona variety) compared to control treatment contaminated by using different addition methods (B1 = B. cinerea, B2 = T. harzianum or T. viride + B. cinerea, B3=B2 + T. harzianum or T. viride after 5 days addition B. cinerea and B4 = B3 + after 10 days from addition of B3) All the best methods treatment was B4.which reduced the infection and severity of gray mold disease on tomato(wijdan variety )and eggplant (Barcelona variety) .