Biological characteristics of Epicocum sorghum,a pathogen of soybean leaf spot disease
In 2023,soybean leaf spot disease caused by Epicocum sorghum was found in Zhaoyuan County,Suihua City,Heilongjiang Province.To clarify the biological characteristics of the pathogen and to scientifically guide the disease prevention and management,the growth rate method was used to study the effects of different nutritional and environmental conditions on the growth of the mycelial growth and sporulation.The results showed that the most suitable medium for mycelial growth and spore production was oat medium(OMA).The optimal carbon source for mycelial growth was maltose,and the optimal nitrogen source was peptone,the optimal temperature was 25℃,pH was 6,and the lethal temperature was 53℃for 15 min.The most suitable carbon source and nitrogen source for sporulation was glucose and urea,respectively;the most suitable temperature was 28℃,and pH was 7.Light had no effect on mycelial growth,while all the dark conditions could promote sporulation.