Milda Ernita, Trimurti Habazar, Nasrun and Jamsari


In modern cultivation processes indiscriminate use of pesticides and fertilizers, has led to substantial pollution of soil, air and water. So,  there is an urgent need  to solve the problem. Rhizobacteria are bacteria that colonize plant roots, and these bacteria are known to stimulate growth  and thereby reduce incidence of plant disease by direct and indirect mechanisms. A total of 136 rhizobacteria isolates  were isolated from different rhizosphere soils in central areas of production of onions in Indonesia. These isolates were screened for their capability to enhance  growth and protect  onions against  bacterial leaf blight disease-caused by Xanthomonas axonopodis pv.allii. The results showed that ten isolates can  enhance  growth and protect  onions against bacterial leaf blight diseases.  Five isolates were isolated from West Sumatra, four isolates from Java and one isolated from  North Sumatra.  All  isolates produced indol-3-acetic acid with different concentrations. Molecular identification  of ten isolates belong to  Bacillus sp, Pseudomonas sp, Stenotrophomonas sp and Serratia sp.


rhizosphere bacteria; bacterial leaf blight disease; onion

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