Streptomyces padanus IA70-5 has been shown to be a promising biological control agent for the suppression of pepper anthracnose. In this study, we assessed the potential use of strain IA70-5 as a biological control agent for Phytophthora blight caused by Phytophthora capsici. Strain S. padanus IA70-5 was found to inhibit the mycelial growth and zoosporangium formation of P. capsici causing Phytophthora blight on pepper plants. In experiments with hot pepper fruit, IA70-5 suppressed the progression of Phytophthora rot by over 90% in pre-inoculated treatments with culture suspension. In experiments with 60-day-old pepper plants, IA70-5 suppressed Phytophthora blight by over 90%. These results demonstrated the potential for S. padanus IA70-5 to provide a practical biological agent for the control of Phytophthora blight in the field.

• Jinwoo Kim(Institute of Agriculture and Life Science, Gyeongsang National University, Division of Applied Life Science, Gyeongsang National Univ) Corresponding author
• Jeung Joo Lee(Institute of Agriculture and Life Science, Gyeongsang National University)
• Daeyoung Son(1Institute of Agriculture and Life Science, Gyeongsang National University)
• Youn-Sig Kwak(1Institute of Agriculture and Life Science, Gyeongsang National University)
• Okhee Choi(Institute of Agriculture and Life Science, Gyeongsang National University)
• Tran Thi Phuong Chi(Institute of Agriculture and Life Science, Gyeongsang National University)