Degradation dynamics of chlorpyrifos, trichlorphon, and cypermethrin residues in onion were investigated.Chlorpyrifos residues showed relatively long residual when sprayed onto onions.

• 摘要研究了毒死蜱、敌百虫和氯氰菊酯不同施药方法在洋葱上的残留降解动态。