Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences, Zhengzhou, 450009, China.
Sci Rep. 2022 Oct 7;12(1):16883. doi: 10.1038/s41598-022-20659-w.
The green peach aphid, Myzus persicae, is one of the most economically important pests in peach-growing areas around the world. In many countries, the application of insecticides is the main method to control and reduce the population of M. persicae. In this study, we investigated the effects and persistence of thiamethoxam against M. persicae by foliar spraying and root irrigation. The residues of thiamethoxam and clothianidin in peach were determined to assess food safety. The results showed that thiamethoxam treatment significantly reduced the population of M. persicae through foliar spraying and root irrigation. And the persistence of root irrigation on M. persicae was significantly longer than that of spraying. Thiamethoxam and clothianidin were absorbed by the roots, transported to other parts of the plant, and concentrated in the leaves, especially new leaves. The final residues of thiamethoxam and clothianidin in peaches were below the maximum residue limit (MRLs). These results suggested that thiamethoxam is more effective in M. persicae control through root irrigation than foliar spraying. The persistence of root irrigation on M. persicae was significantly longer than that of spraying. These results shed some light upon the control of M. persicae by root irrigation of thiamethoxam.
桃蚜，又名烟蚜，是全世界桃种植区最重要的农业害虫之一。在许多国家，使用杀虫剂是控制和减少烟蚜种群的主要方法。本研究通过叶面喷雾和根部灌根的方式，调查了噻虫嗪对烟蚜的防治效果和持效性，并测定了桃中噻虫嗪和噻虫胺的残留，以评估其食用安全性。结果表明，噻虫嗪处理通过叶面喷雾和根部灌根均可显著降低烟蚜的种群数量，且根部灌根处理对烟蚜的持效性明显长于叶面喷雾。噻虫嗪和噻虫胺通过根系被吸收，在植物体内运输，并在叶片中，特别是新叶中积累，最终桃中的噻虫嗪和噻虫胺残留均低于最大残留限量（MRLs）。这些结果表明，与叶面喷雾相比，噻虫嗪通过根部灌根对烟蚜的防治效果更好，持效性也更长。这些结果为噻虫嗪通过根部灌根防治烟蚜提供了一些启示。
