Bumi Sari Farmers Group, located in Abiansemal Village, Badung, is a group of 10 members managing a chili plantation. The main challenges faced by Bumi Sari Farmers Group include persistent wilting of chili plants and fruit rot caused by pathogenic fungi. Trichoderma compost fertilizer has been identified as a solution to these problems, using the concept of natural pest organism control (OPT) to achieve healthy and disease-free plant cultivation. In this initiative, the farmers' group has successfully produced Trichoderma compost fertilizer and applied it to their chili plants. A survey showed that flower damage in chili plants initially reached 75%. However, after the application of Trichoderma compost fertilizer, the disease incidence in chili plants was reduced by 46.4%. This activity has led to a 25% reduction in yield loss and a 20% increase in farmers' income.