30%醚菌酯悬浮剂在黄瓜和土壤中的残留降解行为及安全使用技术

Degradation Behavior and Safely Applying Technology of 30% Kresoxim-Methyl Suspensions in Cucumber and Soil

[目的]评价30％醚菌酯悬浮剂在设施栽培黄瓜上使用后的残留行为及环境安全性.[方法]参照《农药残留试验准则》,通过气相色谱法检测分析黄瓜中醚菌酯含量,研究了30％醚菌酯悬浮剂在黄瓜上的残留动态.[结果]醚菌酯在银川、长沙、哈尔滨黄瓜中的半衰期分别为2.8～3.1、2.4～3.7、2.1～5.1 d,施药3、5、7d黄瓜中醚菌酯的残留量均低于0.500 0 mg/kg,未超出国家限量标准.[结论]建议设施栽培条件下,最高制剂用药量270 g.a.i/ha（制剂0.09 g/m2）,最多施药3次,安全间隔期3～5d.

[Objective] To determine the changes in residue and environmental safety of 30％ kresoxim-methyl suspensions applied on cucumber under greenhouse conditions.[Method] Referring to Test Standard of Pesticide Residues,the residue dynamics of kresoxim-methyl content in cucumber was determined by GC.[Result] The results showed that the half lives of kresoxim-methly in cucumber of Yinchuan,Changsha,Haerbin were 2.8-3.1,2.4-3.7,2.1-5.1 days and the terminal residue in cucumber for 3,5,7 days was less than the limited standards of the state that 0.500 0 mg/kg.[Conclusion] Under the proposed cultivation conditions,the maximum dosage formulations 270 g.a.i/ha （preparation 0.09 g/m2）,spraying up to three times and post-harvest interval was suggested to be 3-5 days.