Author : Maman Suparman

Summary : Four bacterial isolates, namely Serratia marcescens, Burkholderia cepacia, Pseudomonas aeruginosa 1 and P. aeruginosa 2 obtained from the rhizosphere of tomato plants in the field which were antagonistic to the growth of F. oxysporum f.sp. lycopersici in vitro, were evaluated for their ability to suppress Fusarium wilt disease of tomato in the glashouse. The tomato plants were planted in growth media consisting of Holland RHP peat grow, coconut peat and perlite in the ratio of 1:1:1 (v/v). Tomato plants were watered using the drip irrigation system for distribution of hydroponics fertilizer solution. Repeated applications of 10 ml of bacterial suspensions were applied at 10 days and 20 days after sowing at a concentration of 1 x 10 cfu mL. Plants treated with mixture of B. cepacia, P. aeruginosa 1 and P. aeruginosa 2 significantly increased the marketable fruit yield in artificially infected plants compared to the control, although there was not significantly difference as between single treatments of the four bacterial isolates. The experiment carried out in this study indicated that the four antagonistic bacteria functioned as plant growth promoters as well as biological control agents for Fusarium wilt of tomato.