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ISSN : 1225-0171(Print)
ISSN : 2287-545X(Online)
Korean Journal of Applied Entomology Vol.47 No.4 pp.435-445

고추를 가해하는 담배나방[Helicoverpa assulta (Guenée)]의 효과적 방제를 위한 쌀좀알벌(Trichogramma evanescens Westwood)과 미생물제제의 종합생물방제 효과


Efficacy of an Integrated Biological Control of an Egg Parasitoid, Trichogramma evanescens Westwood, and Microbial Insecticide Against the Oriental Tobacco Budworm, Helicoverpa assulta (Guenée) Infesting Hot Pepper

김근섭, 허혜정, 박정아, 유용석, 함은혜, 강성영, 권기면, 이건형, 김용균


  Due to internal feeding behavior, the oriental tobacco budworm, Helicoverpa assulta (Guenée), infesting hot pepper has been regarded to be effectively controlled by targeting egg and neonate larval stages just before entering the fruits. This study aimed to develop an efficient biological control method focusing on these susceptible stages of H. assulta. An egg parasitoid wasp, Trichogramma evanescens Westwood, was confirmed to parasitize the eggs of H. assulta. A mixture of Gram-positive soil bacterium, Bacillus thuringiensis subsp. kurstaki, and Gram-negative entomopathogenic bacterium, Xenorhabdus nematophila ANU101, could effectively kill neonate larvae of H. assulta. A sex pheromone trap monitored the occurrence of field H. assulta adults. The microbial insecticide mixture was proved to give no detrimental effects on immature development and adult survival of the wasp by both feeding and contact toxicity tests. A combined treatment of egg parasitoid and microbial pesticide was applied to hot pepper fields infested by H. assulta. The mixture treatment of both biological control agents significantly decreased the fruit damage, which was comparable to the chemical insecticide treatment, though either single biological control agent did not show any significant control efficacy. This study also provides morphological and genetic characters of T. evanescens.