Abstract
Ralstonia solanacearum (Rs) is a pathogen that causes bacterial wilt on chili. Rs infected more than two hundred crops and caused high impact losses. The methods in controling of Rs by using bactericide which are harmful to the environment. Therefore, it is necessary to control bacterial wilt disease effectively and efficiently by utilizing rhizobacteria rizoplane as biological agents. The aim of this study was to obtain rhizobacteria that colonize root in preventing the entry of Rs through root and stimulating the growth of chili. This experiment consisted of two stages, (i) screening of rhizobacteria isolates and (ii) introduction of selected isolates in suppressing Rs and promoting growth of chili. The research was conducted in randomized block design with 21 treatments with 5 replications for each treatment. Chili seeds were introduced with rhizobacteria isolates before planting. The results showed that there were isolates that were able to increase plant growth, Rp. Han-1.4; Rp. Han-9.2; Rp. Han-6.2; Rp. Han-1.4; 5.2 and Rp. Han-9.1 with effectiveness of 69.20% - 75% (plant height) and 57.29-59.22% (number of leaves). The isolates that were able to suppress disease progression were Rp. Han-1.4; Rp. Han-9.2 and Rp. Han-3.2 with an effectiveness of 44.99 - 53.75% (disease incidency) and 32.09 - 44.95% (disease intensity).
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