<![CDATA[Sclerotium rolfsii Sacc. on soybeans was one of the diseases in the cultivation that caused a decrease in soybeans (Glycine max L.) production. One of the efforts in increasing the growth and the resistance of the soybean was by using the biological agent named Trichoderma spp. This study aimed to control the intensity of the Sclerotium rolfsii that can cause disease in soybeans. this research was conducted from July 2021 to September 2021 at the Biochemical laboratory and at the Green House owned by the Biology Department FMIPA, Udayana University. The research used an completely randomized design (CRD) with five treatments; a) growing media without the treatment (control); b) growing media + 10 g Trichoderma spp., and without S. rolfsii; c) growing media without Trichoderma spp., + 5 g S. rolfsii; d) growing media + 15 g Trichoderma spp., and 5 g S. rolfsii; e) growing media + 20 g Trichoderma spp., and 5 g S. rolfsii. In this research, the treatment was repeated 5 times and 25 combinations of treatments were obtained. Analysis of Variance (ANOVA) was used in this study to analyze the data, it was found that there was a different result <0,05, then it was continued by using the analysis of Post Hoc Duncan Test. According to the research, it was found that there were two different results. Based on in vitro method, it can be concluded that Trichoderma spp. can inhibit S. rolfsii by about 55,56%. Meanwhile, based on in vivo method, it can be concluded that Trichoderma spp. can inhibit S. rolfsii about 40% which the optimal dose of Trichoderma spp. was about 20 g, the highest plant height was 64.4 cm, the highest average dry weight of shoots was 5.1 g, the highest average dry weight of roots was 0.5 g, and the highest average pod weight was 17.0 g.]]>
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