苯醚甲环唑在梨和土壤中的残留动态与安全性评价

Residue Dynamics of Difenoconazole in Pear and Soil and Its Safety Evaluation

通过田间试验,研究了10%苯醚甲环唑水分散粒剂在梨及土壤中的残留动态。结果表明:苯醚甲环唑在梨中降解速度较快,土壤中相对缓慢,梨中半衰期为5.66-7.27 d,土壤中为10.01-19.69 d;两年试验结果表明:10%苯醚甲环唑水分散粒剂按照施药质量分数167、334 mg/kg,施药3、4次,末次施药距收获间隔14 d,梨中苯醚甲环唑残留量均低于0.2 mg/kg,该药按推荐剂量使用是安全的。

A field experiment was conducted to reveal residue dynamics of difenoconazole 10% WG in pear and soil. The result shows that difenoconazole degraded rapidly in the pear, but lowly in the soil relatively. The half-life of difenoconazole in the former was 5.66-7.27 d and in the latter was 10.01-19.69 d. Results of the two-year experiment shows when the pear was sprayed 3 to 4 times with 167 and 334 mg/kg, difenoconazole 10% WG, and the last application was done 14 d before harvesting, the residue of difenoconazole in the harvested pear was lower than 0.2 mg/kg, demonstrating that it is safe to apply difenoconazole to pear with the recommended rate.