The soil sample was pre-treated with 1.5% phenol (Hayakawa and Nonomura, 1989 ; Hayakawa, 2004). Soil sample was suspended to 10 ml 1.5% phenol. The mixed solution was maintained at 30C for 30 min then 1 ml of soil suspension were inoculated into flask containing 20 ml sterile basal medium and PLA film for enrichment. Then, culture broth were diluted and spread onto 0.1% (w/v) emulsified PLA agar supplemented with 100 μg/ml nystatin, 100 μg/ml cycloheximide and 50 μg/ml nalidixic acid (Taechowisan et al., 2003). The plates were incubated at 30C for for 14 days. Visible colonies that formed clear zone on emulsified polymer agar were purified on International Streptomyces Project-2 (ISP-2) medium and also kept in 20% (v/v) glycerol at -20C for long term preservation and deposited in culture collection at the Biology Department, Faculty of Science, Chiang Mai University