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Enhanced Insecticidal Activity of Bacillus thuringiensis against the Diamondback Moth, Plutella xylostella, Using an Immunosuppressive Effect of Juvenile Hormone Analogue, Pyriproxyfen, Formulation  

Kim, Geun-Seob (Department of Bioresource Sciences, Andong National University)
Kim, Yong-Gyun (Department of Bioresource Sciences, Andong National University)
Publication Information
The Korean Journal of Pesticide Science / v.13, no.2, 2009 , pp. 111-116 More about this Journal
Abstract
Juvenile hormone (JH) is an insect hormone mediating immature metamorphosis and adult reproduction. It also mediates immune responses to suppress hemocyte behavior, which is, however, activated by ecdysteroid. This study investigated an effect of a commercial pyriproxyfen (a JH agonist) formulation on a cellular immune response of the diamondback moth, Plutella xylostella, and analysed its mixture with Bacillus thuringiensis (Bt) in insecticidal potency. The commercial pyriproxyfen formulation significantly suppressed hemocyte-spreading behavior at low doses as did in pyriproxyfen technical grade. When the commercial pyriproxyfen formulation was mixed with Bt, Bt toxicity was significantly increased against P. xylostella larvae in laboratory. The mixture effect was then confirmed in field cultivating cabbage infested with P. xylostella larvae. The mixture showed a significantly enhanced mortality and reduced effective lethal time, compared to only Bt treatment.
Keywords
Plutella xylostella; pyriproxyfen; Bacillus thuringiensis; juvenile hormone; integrated biological control;
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