Alfalfa anthracnose is a destructive disease in the alfalfa-planting areas,which was mostly caused by Colletotrichum destructivum.The effects of medium,carbon,nitrogen,temperature,pH,illumination and humidity on the mycelial growth,sporulation and conidia germination of alfalfa anthracnose fungus were studied.The results showed that PDA,PSA and V-8 juice were the optimal medium for hyphal growth;the optimal temperature for mycelium growth ranged from28℃to 36℃,with the optimum temperature of 32℃ and the opti...