GREENHOUSE SCREENING OF TRICHODERMA ISOLATES FOR CONTROL OF CURVULARIA LEAF-SPOT OF YAM

Ten Trichoderma isolates were studied under greenhouse conditions as p otential agents for biocontrol of yam leaf spot, caused by Curvularia eragrostidis. The Trichoderma isolates demonstrated high efficiency of disease control. Application of the antagonists on the same day as C. eragrostidis inoculation showed the best results. One isolate achieve d 75 percent disease severity reduction. The survival of the Trichoder ma isolates decreased after its application on the phylloplane with va lues of 57 and 41 percent at the 49th day, in the absence and presence of the phytopathogen respectively. The antagonism persisted well agai nst C. eragrostidis, the TN1 isolate praises 89 percent.