F. oxysporum became the main obstacle in the pepper seedling. The filtrate culture of F. oxysporum was expected to induce resistance of pepper seedlings to Fusarium infection. The aim of this study was to determine the best concentration of F. oxysporum filtrate culture in inducing resistance of pepper seedlings to F. oxysporum infection. The research was carried out in the Plant Protection Laboratory and Screening House, Faculty of Agriculture, Bengkulu University with the following stages: isolation and identification of F. oxysporum, production of filtrate culture, testing the content of filtrate culture, and testing the concentration of filtrate culture on development of  fusarium wilt on pepper seedlings. The study was arranged in a single factor completely randomized design, namely the concentration of the filtrate culture: 0, 50, 100, 150, and 200 ppm. The variables observed were incubation period, disease incidence, disease severity, stem symptoms, and salicylic acid content. The results showed that the filtrate culture was able to inhibit the development of fusarium wilt disease in pepper seedlings. The filtrate culture concentration of 150 ppm was the best in inhibiting fusarium wilt disease. The synthesis of salicylic acid compounds was able to induce resistance of pepper seedlings to fusarium wilt disease.

Keywords: salicylic acid, Fusarium oxysporum, filtrate culture, pepper.