Perlakuan Benih Cabai (Capsicum annuum L.) dengan Rizobakteri secara Tunggal ataupun Kombinasi untuk Mengendalikan Phytophthora capsici dan Meningkatkan Pertumbuhan Tanaman.

Abstract

Seed treatment of hot pepper using rhizobacteria is an alternative to fungicide in controlling phytophthora blight disease that caused by Phytophthora capsici fungus pathogen. The objectives of this research were to evaluate: (1) the effectiveness of rhizobacteria isolates in inhibiting P. capsici growth, and (2) the effect of seed treatment using rhizobacteria on seed vigor and plant growth, and incidence of phytophthora blight disease. This research consisted of three experiments, all experiments were arranged in completely randomized design using one factor. The first experiment (in vitro) consisted of nine levels i.e. seven combination isolates of rhizobacteria, metalaxyl and untreated control. The second experiment (on the seedbed) consisted of five levels of seed treatments i.e. ST116B rhizobacteria, CM8 rhizobacteria, ST116B + CM8 rhizobacteria, metalaxyl and control. The third experiment (in the green house) consisted of six levels of seed treatments i.e. ST116B rhizobacteria, CM8 rhizobacteria, ST116B + CM8 rhizobacteria, metalaxyl, positive and negative control. Results of in vitro experiment showed that all rhizobacteria, single or combinations, were able to inhibit P. capsici growth. The highest inhibitions were shown by CM8, ST116B, and ST116B + CM8 consequtively. Seed treatments of hot pepper using ST116B, CM8 and ST116B + CM8 rhizobacteria did not increase seed vigor but increased the number of leaves 6 weeks after transplanting, and reduced the incidence of phytophthora blight disease. There were no significant differences whether the rhizobacteria was applied singly or in combination of the two isolates. Rhizobacteria ST116B is suggested to be used in hot pepper seed treatment before planting.