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http://dx.doi.org/10.5656/KSAE.2011.07.0.24

Development of "Bt-Plus" Biopesticide Using Entomopathogenic Bacterial (Xenorhabdus nematophila, Photorhabdus temperata ssp. temperata) Metabolites  

Seo, Sam-Yeol (Department of Bioresource Sciences, Andong National University)
Kim, Yong-Gyun (Department of Bioresource Sciences, Andong National University)
Publication Information
Korean journal of applied entomology / v.50, no.3, 2011 , pp. 171-178 More about this Journal
Abstract
Bacillus thuringiensis (Bt) is a bacterial biopesticide against insect pests, mainly lepidopterans. Spodoptera exigua and Plutella xylostella exhibit significant decreases in Bt susceptibility in late larval instars. To enhance Bt pathogenicity, we used a mixture treatment of Bt and other bacterial metabolites which possessed significant immunosuppressive activities. Mixtures of Bt with culture broths of Xenorhabdus nematophila (Xn) or Photorhabdus temperata ssp. temperata (Ptt) significantly enhanced the Bt pathogenicity against late larval instars. Different ratios of Bt to bacterial culture broth had significant pathogenicities against last instar P. xylostella and S. exigua. Five compounds identified from the bacterial culture broth also enhanced Bt pathogenicity. After determining the optimal ratios, the mixture was applied to cabbage infested by late instar P. xylostella or S. exigua in greenhouse conditions. A mixture of Bt and Xn culture broth killed 100% of both insect pests when it was sprayed twice, while Bt alone killed less than 80% or 60% of P. xylostella and S. exigua, respectively. Other Bt mixtures, including Ptt culture broth or bacterial metabolites, also significantly increased pathogenicity in the semi-field assays. These results demonstrated that the Bt mixtures collectively names "Bt-Plus" can be developed into potent biopesticides to increase the efficacy of Bt.
Keywords
Bacillus thuringiensis; Xenorhabdus nematophila; Photorhabdus temperata; subsp. temperata; Plutella xylostella; Spodoptera exigua; Metabolite; Biopesticide;
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