中文摘要：

采用高效液相色谱（HPLC）测定了吡虫啉经树干注药后在核桃树体中的分布动态。结果表明,树干注药后吡虫啉在核桃树体内具有较好的传导、分布性能,其在不同组织中的含量差异较大,含量由大到小顺序为：叶片〉果皮〉果仁。吡虫啉在核桃树体内残留期较长,注药后60d时,药剂在核桃叶片、果皮和果仁中的含量分别为0.256、0.178和0.046mg/kg;注药后80d时,吡虫啉在叶片、果皮和果仁中的含量均小于0.05mg/kg。根据吡虫啉在核桃果仁中的残留量变化动态及国外相关最大允许残留限量标准,建议在利用吡虫啉树干注药防治核桃害虫时,注药时间距核桃采收期应大于60d。

英文摘要：

Distribution of imidacloprid in walnut tissues after trunk injection was examined by high performance liquid chromatography（HPLC）.The results showed that imidacloprid could be transmitted and distributed in different walnut tissues after application.The concentrations of imidacloprid,which differ in various tissues,varied from high to low in leaves,walnut hull and walnut kernel.The residue of imidacloprid remained a long period in walnut tissues after injection.The concentrations of imidacloprid in leaves,walnut hull and walnut kernel were 0.256,0.178 and 0.046 mg/kg at 60 days after injection,and all were bellow 0.05 mg/kg at 80 days after trunk injection.It is suggested that when imidacloprid through trunk injection is applied to control walnut pest,the period between application time and harvesting time should be kept larger than 60 days.