Beet armyworm, Spodoptera exigua, is known to be hard-to-kill pest by having high resistance to insecticides and its control is intensely dependent on fewer insecticides. In this study, the ethyl acetate extract of Streptomyces sp. was evaluated to find novel insecticidal agents against S. exigua. In order to determine the identity of insecticidal compounds, the crude ethyl acetate extract was fractionated based on the TLC profiling and bioassay-guided monitoring. These results indicated that the non-polar fraction have high level of insecticidal activity against second instars of S. exigua. These findings suggested that secondary metabolites produced by Streptomyces sp. could be considerable potential resources as novel insecticidal formulation candidates.

• Jong Hoon Kim(Department of Agricultural Biotechnology, Seoul National University)
• Jae Young Choi(Department of Agricultural Biotechnology, Seoul National University)
• Dong Hwan Park(Department of Agricultural Biotechnology, Seoul National University)
• Min Gu Park(Department of Agricultural Biotechnology, Seoul National University)
• Ra Mi Woo(Department of Agricultural Biotechnology, Seoul National University)
• Yeon Ho Je(Department of Agricultural Biotechnology, Seoul National University)
• Bo Ram Lee(Department of Agricultural Biotechnology, Seoul National University)