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[目的]通过2年3地的田间试验及残留检测,明确唑胺菌酯在黄瓜及土壤中的消解动态和最终残留量。[方法]消解动态试验按剂量300 g a.i./hm2施药1次;最终残留试验按300 g a.i./hm2(高剂量)和200 g a.i./hm2(低剂量)分别施药4、5次;采用高效液相色谱法对20%唑胺菌酯悬浮剂有效成分进行检测。[结果]2年3地的消解动态试验结果表明:唑胺菌酯在黄瓜和土壤中的消解半衰期分别为2.86~5.63、4.61~13.25 d。最终残留试验结果表明:唑胺菌酯在黄瓜和土壤中的最终残留量分别为<0.020~0.380、<0.020~1.134 mg/kg。[结论]建议唑胺菌酯在黄瓜中的最大残留限量为0.08 mg/kg;20%唑胺菌酯悬浮剂按其推荐剂量200 g a.i./hm2在黄瓜上施用4次,安全间隔期为3 d。
[Objective] The purpose of this study was to determine the digestion and final residues of azadirachtin in cucumber and soil through field experiments and residue tests in 3 years. [Method] The digestion dynamic test was carried out once with the dose of 300 g ai / hm2. The final residue test was applied for 4, 5 times at 300 g ai / hm2 (high dose) and 200 g ai / hm2 (low dose) High performance liquid chromatography (HPLC) was used to determine the active ingredients of 20% azadirachtin suspension. [Result] The dynamic test results of digestion in three years showed that the half-lives of azolesofradipid in cucumber and soil were 2.86 ~ 5.63 and 4.61 ~ 13.25 d, respectively. The results of the final residue test showed that the final residues of azoxystrobin in cucumber and soil were <0.020 ~ 0.380, <0.020 ~ 1.134 mg / kg, respectively. [Conclusion] The maximal residue limit of azoxystrobin in cucumber was suggested to be 0.08 mg / kg. The 20% azoxystrobin suspension was applied to cucumber at the recommended dosage of 200 g ai / hm2 for 4 times with a safety interval of 3 d.