Antagonist Test of Endophytic Fungi Against Hiyung Chili Leaves Growth of Fusarium Oxysporum Causes Fusarium Wilt

F. oxysporum, which causes fusarium wilt, is a pathogen that spreads through the soil and can survive in the soil as mycelium or spores without a host. F. oxysporum usually attacks chili planting areas and can cause disease losses of up to 80%. Farmers usually control disease using chemicals or pesticides as the main control. Continuous use of pesticides can result in the death of natural enemies and cause pathogen resistance. One effort to overcome fusarium wilt without using pesticides is to use antagonistic agents, one of which is endophytic fungi. Endophytic fungi are fungi that are found in plant tissue systems such as leaves, flowers, twigs or plant roots. This research used a non-factorial Completely Randomized Design (CRD) with 5 treatments and 4 replications, so that 20 experimental units were obtained. Based on the research results, it shows that the endophytic fungus of hiyung chili leaves has a significant effect on the growth of F. oxysporum by inhibiting mutually intermingling growth mechanisms or competition mechanisms by isolate P1 (Acremonium sp.) and isolate P2 (Cladosporium sp.), mutually slight inhibition or antibiosis mechanisms by isolate P3 (Rhizoctonia sp.) and isolate P5 (Alternaria sp.), while overgrowth by antagonism or parasitism mechanism by isolate P4 (Sclerotium sp.). The fungus isolate with the highest inhibitory power was isolate P5 (Alternaria sp.), reaching 34.72% at 7 DAP. Meanwhile, the fungus isolate with the lowest inhibitory power was shown by isolate P2 (Cladosporium sp.), which only reached 17.46% at 7 DAP.