Entomopathogenic fungus is a useful control agent to sucking type insect such as whitefly and aphid. The fungi are influenced by some environmental factors such as relative humidity, temperature and UV and cause slow and fluctuation in pest control efficacy. Especially, UV kills conidia or spores of entomopathogenic fungi and a mycopesticide using fungi has short control period in field. UV intensity changes from season to season. Survival rate of entomopathognic fungi treated may differ from seasons and will show different control efficacy. Therefore, we conducted a study to estimate the persistence of an Isaria javanica isolate, which was already reported as sweet potato whitefly control agent, in potted greenhouse soil planted different crops. The number of survival spore decreased gradually and differ from seasons.

• Jeong Seon Yu(Agricultural Microbiology Division, National Institute of Agricultural Sciences)
• Jin Ju Yun(Agricultural Microbiology Division, National Institute of Agricultural Sciences)
• Byung Ju Lee(Agricultural Microbiology Division, National Institute of Agricultural Sciences)
• Jeong Hwa Huang(Agricultural Microbiology Division, National Institute of Agricultural Sciences)
• Jeong Jun Kim(Agricultural Microbiology Division, National Institute of Agricultural Sciences)
• Ji Hee Han(Agricultural Microbiology Division, National Institute of Agricultural Sciences)
• Sang Yeob Lee(Agricultural Microbiology Division, National Institute of Agricultural Sciences)