For effective control of insect pest which can outbreak in a field during crop cultivation, various control agents such as eco-friendly agricultural materials (EFAM) including microbial control agents and chemical pesticides have been applied at fields and these control agents may be treated simultaneous or sequential in the same field to suppress diverse pests and diseases. The agents may influence each other and control efficacy may also differ from interactions. Therefore we need to test compatibility of microbial control agents with other agricultural agents. In this study, we investigated influence of pre-treated EFAMs, which are registered for whitefly control in greenhouse, on germination, mycelial growth and control efficacy of Isaria javanica isolate against sweet potato whitefly. The results showed that a mixture of paraffin oil+cinnamon oil among 4 EFAMs highly reduced germination (8.9±1.3%~24.5±0.9%) and mycelial growth (0.81±0.01cm~0cm) of I. javanica. To investigate the effects of the treatment interval between EFAMs and I. javanica on sweet potato whitefly control, four different EFAMs were pre-treated 0, 1, 4, and 7 days before applying I. javanica. Pre-treatment of four EFAMs inhibited insecticidal activity of I. javanica against sweet potato whitefly. Therefore when EFAMs and a mycopesticide using I. javanica spray simultaneous or sequential, application of EFAMs need more than 7 days interval after treatment of mycopesticide at field.

• 이병주(농촌진흥청 국립농업과학원) | Lee, Byung-Ju
• 한지희(농촌진흥청 국립농업과학원) | Han, Ji-Hee
• 황정화(농촌진흥청 국립농업과학원) | Huang, Jeong-Hwa
• 김정준(농촌진흥청 국립농업과학원) | Kim, Jeong-Jun Corresponding author
• 이상엽(농촌진흥청 국립농업과학원) | Lee, Sang-Yeob