种子丸粒化包衣处理后氟啶虫胺腈的消解动态及对黄曲条跳甲的防控效果

Degradation dynamics of sulfoxaflor in Choy sum plants and soil after seed pelletizing treatment and the effectiveness of this pesticide against Phyllotreta striolata(Fabricius)

【目的】明确丸粒化包衣处理后氟啶虫胺腈在菜薹体内的消解动态和对黄曲条跳甲Phyllotreta striolata (Fabricius)的防控效果,为十字花科蔬菜种子丸粒化包衣的科学应用提供参考。【方法】应用高效液相色谱法分析了氟啶虫胺腈在菜薹各营养器官和根系周边土壤中的消解动态。【结果】氟啶虫胺腈在土壤中的浓度呈现先增加后降低的发展趋势,播种后第1天氟啶虫胺腈在土壤中的浓度为17.03mg/kg,第10天升高至33.87 mg/kg,随后缓慢下降,在第31天时下降到0.17 mg/kg。氟啶虫胺腈在菜薹根和叶中的浓度也呈现先增加后降低的发展趋势,播种后第4天根、叶中的浓度分别为82.14 mg/kg和279.67 mg/kg,随后逐渐升高,在第7天达到56.85 mg/kg和325.27 mg/kg,此后缓慢下降,第31天时氟啶虫胺腈在根和叶中的浓度均低于检测限。氟啶虫胺腈在菜薹茎中的浓度呈现下降趋势,播种后第4天茎中氟啶虫胺腈的浓度为81.47 mg/kg,然后一直下降,直至第31天时低于检测限。田间试验结果显示菜薹种子应用氟啶虫胺腈丸粒化包衣技术处理后黄曲条跳甲的田间种群数量和受害株数均显著低于对照组。【结论】本研究证明了氟啶虫胺腈丸粒化包衣在菜薹生产中安全可行,并且对黄曲条跳甲防控效果显著,为黄曲条跳甲的防治和十字花科作物的安全生产提供了一个有效的解决方案。

[Objectives] To clarify the degradation dynamics of sulfoxaflor in choy sum(Brassica rapa var. Parachinensis) and its effectiveness against Phyllotreta striolata(Fabricius) after seed pelleting treatment, and to provide a reference for the scientific application of the seed pelleting for cruciferous vegetables. [Methods] The degradation dynamics of sulfoxaflor in the vegetative organs and root soil of choy sum were analyzed by High-performance liquid chromatography(HPLC). [Results] The concentration of sulfoxaflor in soil first increased, then decreased, from 17.03 mg/kg the first day after sowing to 33.87 mg/kg on the 10 th day to 0.17 mg/kg at the 31 st day. The sulfoxaflor concentration in the roots and leaves of choy sum also first increased, then decreased, from 82.14 mg/kg and 279.64 mg/kg, respectively, on the 4 th day, to 156.85 mg/kg and 325.22 mg/kg on the 7 th day, before falling to below the detection limit on the 31 st day. The concentration of sulfoxaflor in the stem of the choy sum decreased from 81.47 mg/kg on the 4 th day to below the detection limit on the 31 st day. The results of field experiments show that both numbers of P. striolata and damage to choi sum plants were significantly lower than in the control group. [Conclusion] Pelleting of vegetable seeds with sulfoxaflor is safe for the production of choy sum. This method provides an effective solution for the prevention and control of the P. striolata and the safe production of cruciferous crops.