Effectiveness of Trichoderma sp. and Compost on the Intensity of Fusarium sp. Disease Attack and Growth of Shallots (Allium cepa)

Shallots (Allium cepa) are a key agricultural commodity in Indonesia, serving as a significant economic contributor and export product. However, production is often hampered by Fusarium wilt caused by Fusarium oxysporum, leading to decreased yield and quality. This study aimed to evaluate the effectiveness of Trichoderma sp., compost, and their combination in controlling Fusarium wilt and improving shallot growth. The research was conducted from July to September 2022 using a completely randomized design with four treatments: control (T0), Trichoderma sp. (T1), compost (T2), and Trichoderma sp. + compost (T3). Results showed T3 significantly reduced disease intensity (20.31%) compared to T0 (53.12%) and enhanced plant height, leaf number, and bulb production. The combined application of Trichoderma sp. and compost is recommended as an eco-friendly alternative to synthetic fungicides for sustainable shallot cultivation.