Rhizoctonia solani is a soil-borne pathogen found in soybean plants. The attack can cause the soybean plants to collapse. The attack phase of Rhizoctonia solani occurs in the seedling phase of soybean plants. One of the control techniques for suppressing the attack of the fungus can be done with preventive measures using biopesticides. This study aims to determine spore viability, spore density, incubation period, disease incidence, disease severity, and effectiveness of control after the application of Trichoderma harzianum active ingredient biopesticide with different storage times. The research was conducted at the HPT Green House, Faculty of Agriculture, University of Jember. The experimental design used a factorial design and was repeated 3 times. The results showed that the effect of giving fish meal formulations on the germination ability of Trichoderma harzianum, incubation period, disease incidence, disease attack, and control effectiveness at 30 days of storage was able to suppress the attack of the fungus Rhizoctonia solani. The results of the analysis test were significantly different when compared to the control treatmen.
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