Induced resistance of Potato (Solanum tuberosum L.) toward Ralstonia solanacearum disease with combination of several bio-control microbes

The research aims to study the influence of bio-control microbes of Trichoderma viride., Streptomyces sp. and Pseudomonas fluorescens on the resistence of potato crop toward Ralstonia solanacearum disease and to get a combination of the best bio-control microbes to increase potato growth and yield. The research was conducted on February to June 2013 at the screen house of School of Agriculture of Unisma. As the research treatment, the selected isolates of Trichoderma viride, Streptomyces sp., and Pseudomonas fluorescens were applied as a single treatment or in combination. The tested treatments were arranged in completely randomized block design (RAK) with nine treatments and three repetitions. Research result showed that treatment of application with Pseudomonas fluorescens, either as single treatment or in combination with Streptomyces sp. and Trichoderma viride + Streptomyces sp., has potential to induce resistance toward Ralstonia solanacearum disease on potato. It is showed by its ability to extend the incubation period of 11 – 13 days, reduce the disease incidence of 72.01 – 76.55%, reduce population density of R. solanacearum of 50.79% - 57.81%, increase the total phenol of crop’s leaves, increase crop’s length 7.09 – 12.49% and increase tuber fresh weight of 149.29 – 150.27%. Keywords: induced resistance, Solanum tuberosum L., Ralstonia solanacearum, bio-control microbe