Influence of Environmental Factors on the Growth and Development of Cercospora personata

In this paper,influence of environmental factors on the growth and development of Cercospora personata in peanut was investigated by determining the conidia germination rate and mycelium growth rate.The results indicated that the optimum temperature,pH value and lethal temperature for the pathogen growth were 28℃,6 and 60℃,respectively.Alternation of illumination and darkness was conductive to mycelium growth,the pathogen Cercospora personata could grow on several media,of them,Landers,juice of peanut leaf and V8 were the most suitable media.Among carbon nutrition,sucrose and glucose were the best ones for the pathogen growth,and among nitrogen nutrition,beef extract and peptone were the best ones for the pathogen growth.The optimum temperature,pH value and lethal temperature for the conidia germination is 25℃,6 and 52℃,respectively.Conidia germination rate was higher in water droplets.Alternation of illumination and darkness was helpful to conidia germination.