Study on residue and dissipation dynamics of pyridaben in citrus and soil

The degradation and final residue of pyridaben in citrus and soil were studied by the method of methanol extraction,Al_2O_3 column purification,and GC-ECD detection.The recovery rate of this method ranged from 80.98% to 100.78% with variation coefficient of 1.53%-4.51%.The final residue of pyridaben in full fruit 14 d after the last spraying was below 0.004 mg/kg.The half-lives of pyridaben in citrus peel and soil were 7.17-10.31 d and 5.16-11.55 d,respectively.