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Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
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Your Position :Home->Past Journals Catalog->2016年53 No.2

Population dynamics and insecticide resistance of the diamondbackmoth on plateau spring rape crops
Author of the article:LAI You-Peng** FENG Li-Rong GUO Qing-Yun***
Author's Workplace:Plant Protection Institute of Qinghai Academy of Agriculture and Forestry Sciences, Qinghai Province Key Laboratory of IntegratedPest Management, Xining 810016, China
Key Words: plateau spring rape, diamondback moth, population dynamics, resistance
Abstract:

        [Objectives]  To understand the population dynamics and insecticide resistance of the diamondback moth in plateau spring rape crops. [Methods]  The population dynamics of a wild diamondback moth population of were investigated by trapping and insecticide resistance was assayed with the leaf-diping method. The control effect of different insecticides was also assessed. [Results]  Three generations of the diamondback moth occurred annually at Qinghai, the third generation was significantly smaller than the first and second at altitudes higher than 2 500 m. Most moth activity occurred between 20:00 to 04:00. The diamondback moth cannot overwinter at Qinghai. A Huangzhong diamondback moth population developed low level resistance to bromine cyanide, intermediate resistance to spinosad and diafenthiuron, high resistance to Btbeta-cypermethrin and indoxacarb, and extremely high resistance to avermectin, pyridine long and methyl chloride amide. A Huzhu population developed low level resistance to bromine cyanide and diafenthiuron, intermediate resistance to spinosad and pyridine long, high resistance to Btmethyl chloride amide and indoxacarb, and extremely high resistance to avermectin. The results of the leaf-dipping bioassay and field monitoring were generally consistent. For example, the leaf-dipping bioassay indicated that moths were least resistant to bromine cyanide and this insecticide was the most effective at controlling them in the field. [Conclusion]  The diamondback moth has fewer generations at Qinghai and cannot overwinter there. Plutella xylostella (L.) in spring rape fields have developed resistance to most insecticides.

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