Wizra, N.Roza, R. M.Martina, A.2014-03-282014-03-282014-03-28Rangga Dwijunanda Putrahttp://repository.unri.ac.id/xmlui/handle/123456789/5974The plant disease caused by Xanthomonas oryzae pv. oryzae is still the major problem that can reduce agriculture productivity up to 20%. Currently the use of chemical bactericides can cause environment pollution and resistance to bacteria. Microorganisms can be used as biocontrol agent that is environmental friendly and potential to be developed. This study aimed to find the potential microbe from peat land at Rimbo Panjang village, Kampar Riau to produce antibacterial activity against Xanthomonas oryzae pv.oryzae. Antibacterial activity of microbe was tested using agar disk method and measured based on the ratio between the clear zone and colony diameter (ratio Z/K). The results showed 21 isolates of actinomycetes and 23 fungus isolates had antibacterial activity. The highest ratio activity for actinomycetes isolates was produced by Streptomyses RBIS6 (2.98) while the highest ratio for fungus isolates was produced by of Penicillium sp. L5J15 (2.00). Actinomycetes were the most potential microbes to produce antibacteria than the other microbes.otherantibacterial activityactinomycetesfungiRiau peat landXanthomonas oryzae pv. oryzaeOther