| 陈博聪1, 张燕宁2, 刘同金3, 阴 筱1, 朱其松1, 蒋红云2*, 马 惠1*.噻虫嗪对田间麦蚜种群防控效果与残留消减动态的关系[J].植物保护,2019,45(1):98-103. |
| 噻虫嗪对田间麦蚜种群防控效果与残留消减动态的关系 |
| Relationships between the control effect on aphid populations and theresidue decline dynamics of thiamethoxam in wheat fields |
| 投稿时间：2018-03-10 修订日期：2018-05-17 |
| DOI：S 435.12 |
| 中文关键词: 噻虫嗪 麦蚜 田间药效 残留 消减动态 |
| 英文关键词:thiamethoxam wheat aphid field efficacy residue decline dynamics |
| 基金项目:国家重点研发计划(2016YFD0200503) |
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| 中文摘要: |
| 为评价噻虫嗪在小麦生产上应用的安全性, 本研究进行了21%噻虫嗪悬浮剂对田间麦蚜的防控试验, 并测定了噻虫嗪在小麦植株及籽粒中的残留。结果表明:21%噻虫嗪 SC 23.625 g/hm2防治麦蚜效果最佳, 药后3 d, 对麦蚜相对防效可达到91.48%, 其次为21%噻虫嗪SC 15.75 g/hm2, 药后3 d, 相对防效可达到87.48%, 且与噻虫嗪23.625 g/hm2差异不显著。残留消解动态检测结果表明, 在小麦抽穗期施用21%噻虫嗪SC 15.75 g/hm2防治小麦蚜虫, 在小麦植株中的半衰期为4.8 d, 药后14 d消解92%, 半衰期较短, 消解速度较快。最终残留试验表明, 21%噻虫嗪SC, 用药量15.75~23.625 g/hm2, 小麦生长后期连续施药1~2次, 最后一次用药后7、14、21 d采收的小麦籽粒中未检出噻虫嗪(<0.01 mg/kg)。建议用21%噻虫嗪SC防治小麦蚜虫, 最高制剂用药量75 g/hm2(有效成分15.75 g/hm2), 在小麦抽穗期施药一次, 安全间隔期14 d。 |
| 英文摘要: |
| To assess the safety of thiamethoxam in wheat, we designed the control effect experiment of 21% thiamethoxam 21% SC against wheat aphids in fields and detected the residue of thiamethoxam in wheat plants and the grains. The results showed that thiamethoxam 21% SC (23.625 g/hm2) was the best, and its relative control effect was 91.48% at 3 d after spraying. The relative control effect of thiamethoxam 21% SC (15.75 g/hm2) amounted to 87.48% at 3 d after spraying. The difference was not significant in the relative control effect between the two dosages of thiamethoxam (23.625 g/hm2 and 15.75 g/hm2). We investigated the residue dynamics of thiamethoxam 21% SC in wheat plants during heading period. The results showed that the decomposition half-life of thiamethoxam (15.75 g/hm2) 21% SC was 4.8 d in wheat plants. Thiamethoxam was removed by 92% after 14 d. It had a short half-life and faster degradation speed. The results of residue experiments indicated that, when the dosage of thiamethoxam 21% SC ranged from 15.75 to 23.63 g/hm2 (continuous spraying 1-2 times at later growth stage of wheat), no thiamethoxam residues could be detected from wheat grains at 7, 14, 21 d after the last spraying (residues< 0.01 mg/kg). It was suggested that the highest dosage of thiamethoxam 21% SC for controlling wheat aphids was 75 g/hm2 (effective constituent: 15.75 g/hm2) by spraying one time during heading stage, and the chemical safety interval period was 14 d. |
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