Studies on Antagonism of Trichoderma Species to Fusrium oxysporum f. sp. fragariae V. Biological Control of Fusarium Wilt of Strawberry by a Mycoparasite, Trichoderma harzianum

딸기 시들음병균에 대한 Trichoderma속 균의 길항작용에 관한 연구 V. 중복기생균 Trichoderma harzianum에 의한 딸기 시들음병의 생물적 방제

The biological control effect of Trichoderma harzianum on the Fusarium wilt of strawberry and several factors affecting on its efficacy were examined through pot experiments. T. harzianum grown on wheat barn, rice straw, rice hull, sawdust or barley straw was respectively incorporated into the pathogen-infected soil, and significantly suppressed the strawberry wilt caused by Fusarium oxysporum f. sp. fragariae. The wheat bran or rice straw culture of T. harzianum suppressed the disease incidence more effectively than other substrates for culture, decreasing it to 68% of the untreated control. The conidial suspension of T. harzianum alone or the suspension mixed with crab shell also effectively reduced the disease incidence. The control effectiveness of T. harzianum was high in acid soil (pH 3.5~5.5). In sandy loam soil, the disease incidences and population densities of the pathogen were decreased by the treatment of T. harzianum, while there was no significant effect of T. harzianum on the pathogen in loam soil.