Synergistic Effect of Sulfoxaflor and Indoxacarb on Brown Planthopper,Nilaparvata Lugens （Stål）

CAI Yongfeng; XIAO Caiyun; WU Shuai; ZHENG Maobin; LI Ming; LI Rongyu

doi:10.15886/j.cnki.rdswxb.2019.03.014

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Laboratory toxicity of sulfoxaflor and indoxacarb was determined by rice seedling dipping method. Populations of Nilaparvata lugens（Stål） collected from 3 areas in Guizhou and susceptibility population were used to determine their susceptibility to sulfoxaflor and indoxacarb. The results showed that a baseline of relative susceptibility toxicity of N. lugens（Stål） to sulfoxaflor and indoxacarb were established, with LC₅₀ being 1.83 mg/L and 17.57 mg·L^-1, respectively. Compared with the susceptible strain of N.lugens, the populations collected in Guizhou were sensitive to sulfoxaflor and indoxacarb, and their resistance ratios were 1.73—4.65 and 1.23—3.44, respectively. The mixture of sulfoxaflor and indoxacarb at a mass ratio of 1:1 had the best synergistic effect on the populations of N.lugens（Stål） and its co-toxicity coefficient was 186.85.

Synergistic Effect of Sulfoxaflor and Indoxacarb on Brown Planthopper,Nilaparvata Lugens （Stål）

1. Institute of Crop Protection, Guizhou University, Guiyang GuiZhou 550025;

2. Guizhou Key Laboratory for Agricultural Pest Management in Mountainous Region, Guizhou University, Guiyang, Guizhou 550025;

3. College of Agriculture, Guizhou University, Guiyang, Guizhou 550025

Received Date: 2019-07-05

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Abstract: Laboratory toxicity of sulfoxaflor and indoxacarb was determined by rice seedling dipping method. Populations of Nilaparvata lugens（Stål） collected from 3 areas in Guizhou and susceptibility population were used to determine their susceptibility to sulfoxaflor and indoxacarb. The results showed that a baseline of relative susceptibility toxicity of N. lugens（Stål） to sulfoxaflor and indoxacarb were established, with LC₅₀ being 1.83 mg/L and 17.57 mg·L^-1, respectively. Compared with the susceptible strain of N.lugens, the populations collected in Guizhou were sensitive to sulfoxaflor and indoxacarb, and their resistance ratios were 1.73—4.65 and 1.23—3.44, respectively. The mixture of sulfoxaflor and indoxacarb at a mass ratio of 1:1 had the best synergistic effect on the populations of N.lugens（Stål） and its co-toxicity coefficient was 186.85.

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Synergistic Effect of Sulfoxaflor and Indoxacarb on Brown Planthopper,Nilaparvata Lugens （Stål）

doi: 10.15886/j.cnki.rdswxb.2019.03.014

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