Shallot (Allium cepa L.) is a root crop widely grown and used as a food ingredient and spice in food preparation. Shallot plants have green leaves that grow upright and bulbs that form and develop underground. Wilt disease (Fusarium oxysporum f.sp. cepae) is an affecting disease that often attacks shallot crops. The presented research sought to determine the influence and interaction between cultivars and biological agents in controlling wilt disease and their correlation with the shallot‟s growth components. This research transpired from June to October 2023 at the experimental garden, Universitas Samudra, Aceh, Indonesia. The experiment comprised a randomized complete block design (RCBD) with two factors and four replications. The first factor included three shallot cultivars, i.e., Bima Brebes, Tajuk, and Batu Ijo. The second factor was the provision of Trichoderma, namely, T. viride and T. harzianum, and no Trichoderma (control). The shallot cultivar Batu Ijo, interacting with T. harzianum, showed the best growth characteristics in plant height against the wilt disease, and T. harzianum also slowed down the F. oxysporum infection rate in shallot plants.

Keywords: Shallot (A. cepa L.), cultivars, growth characteristics, Fusarium oxysporum f.sp. cepae, Trichoderma species, wilt disease

Key findings: Shallot (A. cepa L.) cultivars, in integration with Trichoderma species, showed the best response for growth and development characteristics by revealing tolerance to the wilt disease (Fusarium oxysporum f.sp. cepae).