丁虫腈在甘蓝中的残留特性及安全使用

采用田间试验的方法，对丁虫腈在甘蓝及土壤中的残留消解动态及最终残留量进行了研究，并对其在甘蓝上的安全使用进行了评价。消解动态试验结果表明：丁虫腈在土壤及甘蓝中均消解较快，在土壤中的半衰期为2.89～4.41 d，药后14 d消解率91%以上，在甘蓝中的半衰期为1.18～1.28 d，药后3 d消解率95%以上|最终残留量试验结果表明：80%丁虫腈水分散粒剂在甘蓝上用于防治菜青虫，以31.2、46.8 g?hm-2（有效成分）兑水喷雾，连续喷药2～3次，喷药后7、14、21 d收获的甘蓝中丁虫腈残留量0.002 1～0.016 mg?kg-1，均低于0.05 mg?kg-1，因此，按照推荐使用剂量在甘蓝上使用，按采收间隔期7 d收获是安全的。

Residue Studies and Safe Application of Flufiprole in Cabbage

A field experiment was conducted to reveal residual degradation dynamics and the final residues of flufiprole in cabbage and soil．And its safe application in cabbage was assessed．The results of degradation dynamic test showed that the half-life of flufiprole in soil and cabbage was 2.89-4.41 d and 1.18-1.28 d，respectively．The final residue tests showed that flufiprole 80% WG was sprayed for 2 to 3 successive times at application dose 31.2，46.8 g?hm-2 at 7th，14th and 21st day after the last application．The final residues of flufiprole in cabbage was 0.002 1-0.016 mg?kg-1，which was below the MRLs 0.05 mg?kg-1．Therefore，pre-harvest interval was suggested to be 7 days when flufiprole was applied at recommended dosage for cabbage．