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journal1 ›› 2017, Vol. 33 ›› Issue (6): 774-779.DOI: 10.16409/j.cnki.2095-039x.2017.06.009

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Insecticidal Activity of Four Different Bt Toxins against Six Important Lepidopteran Pests

LIU Chen, CHEN Lin, WANG Bingjie, ZHAO Man, LIANG Gemei, GUO Yuyuan   

  1. State Key Laboratory of Insect Pests and Plant Diseases/Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
  • Received:2017-06-07 Online:2017-12-08 Published:2017-12-16

Abstract: Selection of Bt toxin with high efficiency against target pests and low harm to non-target creatures is very important for the development of novel Bt bio-insecticide or insecticidal gene in the future. We tested the insecticidal efficiency of 4 different Bt toxins (Cry2Ab4, Cry2Ah1, Cry1Ca7 and Vip3Aa11) against 6 species of lepidopterans pests, including Helicverpa armigera, Spodoptera exigua, Spodoptera litura, Mythimna separate, Ostrinia furnacalis and Chilo suppressalis. The results showed that Cry2Ab4 had wide insecticidal spectrum, it had high insecticidal efficiency against all the six species of lepidopteran pests; especially, it had obvious toxicity effect on H. armigera, S. exigua, S. litura and O. furnacalis. Cry2Ah1 had good lethal effect on H. armigera, S. exigua, S. litura and had certain efficiency against O. furnacalis and C. suppressalis; meanwhile it had significant weight inhibition effect on M. separate rather than lethal effect. Cry1Ca7 had obvious control efficiency against S. exigua and S. litura,and also good effects on H. armigera and C. suppressalis. Cry1Ca7 had lower insecticidal efficiency against O. furnacalis and no activity against M. separate. Vip3Aa11 had good efficiency against S. exigua and S. litura, and adequate effects on O. furnacalis, H. armigera and C. suppressalis, while had no activity against M. separate.

Key words: Bt, lepidopteran pests, insecticidal efficiency, pest control

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