Poster: Biology & Disease Mgmt: Biological Control
Incidence of soybean frogeye leaf spot in Korea and selection for antagonistic bacteria controlling Cercospora sojina Hara
I. KANG (1), I. Kang (1), H. Shim (2), D. Shin (2), J. Roh (2), S. Heu (2) (1) National Institute of Crop Science, South Korea; (2) National Institue of Crop Science, South Korea
Soybean frogeye leaf spot caused by the fungus Cercospora sojina Hara, has been seen a steady increase in the incidence and prevalence on soybean in Korea. The nationwide survey of the occurrence of frogeye leaf spot showed that 11 out of 28 regions in 2015 had been infected with Cercospora sojina Hara. To control the disease, an isolate which showed strong inhibitory effect on the mycelial growth and conidial germination of Cercospora sojina Hara was selected among the antagonistic bacterial isolates collected from soybean grown soil and the bacterial isolate was identified as Paenibacillus polymyxa using 16S rRNA sequence analysis. Bacillus subtilis QST713(Serenade) was also inhibitory effect on the mycelial growth and conidial germination. The inhibition rates of these antagonistic bacteria were 53%, 75%, respectively. They could be effectively used for controlling soybean frogeye leaf spot.