双炔酰菌胺在荔枝上的残留动态及合理使用技术研究

Residues Dynamics and Reasonable Use Technology of Mandipropamid in Litchi

为了评价双炔酰菌胺在荔枝上的残留动态并建立合理使用技术,在南宁、海口两地同时进行了双炔酰菌胺在荔枝上的残留动态试验。结果表明,双炔酰菌胺在荔枝果实(全果)中的半衰期为6.2～7.3d,在土壤中的半衰期为6.6～10.1d;双炔酰菌胺在荔枝全果中的最终残留量为未检出～0.055mg·kg-1,果肉中的最终残留量为未检出～0.015mg·kg-1,果壳中的最终残留量为未检出～0.124mg·kg-1。250g·L-1双炔酰菌胺悬浮剂在荔枝上合理使用技术为:以有效成分浓度125～250mg·kg-1常规喷雾处理3次,安全间隔期为3d,双炔酰菌胺在荔枝中最高残留限量(MRL值)推荐值为0.5mg·kg-1。

The research aimed to assess residues dynamics of mandipropamid in Litchi and establish guideline for safety application.Field trail for mandipropamid residue in Litchi were conducted in Nanning and Haikou.The results showed that the half-life of degradation for mandipropamid was 6.2～7.3 d in Litchi,6.6～10.1 d in soil.The final residues quantity were no detection～0.055 mg·kg-1 in Litchi samples,no detection^0.015 mg·kg-1 in Litchi flesh samples,no detection～0.124 mg·kg-1 in Litchi peel samples when the last spraying mandipropamid after 3,7,10 days.The reasonable use technology was sprayed 3 times with 125～250 mg·kg-1 of mandipropamid,the preharvest interval was 3 days,the maximum residue limit was recommended 0.5 mg·kg-1.