<![CDATA[ABSTRACT Production of large red chilies has decreased due to wilt disease. Continuous use of synthetic fungicides will have a negative impact on the ecosystem and health. Vegetable pesticides are one of the environmentally friendly pesticides, because they are easily decomposed in nature. Trembesi (Samanea saman (Jacq.) Merr) is one of the plants that has the potential to be used as a botanical pesticide. This research aims to determine the ability of trembesi leaf extract to inhibit the growth of Fusarium spp. Diffusion well method to determine the inhibitory power of trembesi leaf extract with optimal concentration in vitro. One-way ANOVA test was used to analyze research data. If there is a significant difference (P <0.05), then proceed with the Duncan post-hoc test. The results showed that the control group and the extract treatment group had significant differences (P <0.05). The largest inhibitory zone is a concentration of 20% with an inhibitory zone diameter of 21.37 mm Kata kunci: Extract, inhibitory, antifungal, Fusarium]]>
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