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| Effects of spatial differences of pymetrozine on control efficacy of Laodelphax striatellus in rice |
| Received:September 12, 2020 |
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| KeyWord:rice;pymetrozine;residue;control efficacy;spatial difference;Laodelphax striatellus |
| Author Name | Affiliation | E-mail | | SHEN Yan | Jiangsu Key Laboratory for Food Quality and Safety, State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing 210014, China | | | LU Fei | Jiangsu Key Laboratory for Food Quality and Safety, State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing 210014, China | | | YU Xiang-yang | Jiangsu Key Laboratory for Food Quality and Safety, State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing 210014, China | | | LIANG Ying | Jiangsu Key Laboratory for Food Quality and Safety, State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing 210014, China | | | GAO Qing-chao | Jiangsu Key Laboratory for Food Quality and Safety, State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing 210014, China | | | ZHANG Zhi-yong | Jiangsu Key Laboratory for Food Quality and Safety, State Key Laboratory Cultivation Base, Ministry of Science and Technology, Nanjing 210014, China | 4615741@qq.com |
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| Abstract: |
| In order to study the Effects of spatial differences of pymetrozine on control efficacy of Laodelphax striatellus in rice, the residues of pymetrozine in different agricultural areas of China were detected by liquid chromatography tandem triple quadrupole mass spectrometry (LC-MS/MS), and the characteristics of the pymetrozine residues were analyzed. The results showed that 2 h after treatment, the upper part of rice in Jiangsu, Hunan, Guangxi, and Heilongjiang accounted for more than 66.7% of the whole plant deposition. The pymetrozine deposition in the upper part of the rice plant in Heilongjiang Province was higher than in the other three regions. The half-life of pymetrozine in the upper part of rice plants in Jiangsu, Hunan, Guangxi, and Heilongjiang was 2.1, 1.0, 2.1, and 2.4 days, respectively, while that in the lower part was 2.8, 1.7, 3.2, and 3.6 days, respectively. The degradation of pymetrozine in the upper part of the rice plant was faster than that in the lower part of the plant. The results showed that 75% the recommended maximum amount of pymetrozine on rice (56 g·hm-2, based on the active ingredients) could effect control in Jiangsu and Hunan Provinces. The dosage of pymetrozine should be 1.5 times the recommended dosage(112.5 g·hm-2, based on active ingredients) in the Guangxi double-cropping rice area. The dosage of pymetrozine should be 100% the recommended dosage(75 g·hm-2, based on active ingredients) in Heilongjiang Province. The appropriate pesticide dosage should be set according to the target pest control in the rice planting area, so as to avoid the effect of the excessive use of pesticides on the environment, and the insufficient use of pesticides in the control of pests. |
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