Final residues and residue dynamics of difenoconazole in banana

Degradation dynamics and final residues of difenoconazole in banana were estimated by GC-ECD and field experiment.The results showed that the half-life of difenoconazole in banana was 17.2 to 22.4 days in Yunnan,Hainan and Guangdong.The results of the final residue assay indicated that the residue levels of difenoconazole in banana all increased as the application dosage and application times increased,or as the harvest interval decreased.When the banana was treated by 25% difenoconazole,EC at recommended dose 3 times,on day 42 after the last application,the final residues of difenoconazole in the banana were below 0.33 mg·kg-1,and the final residues of difenoconazole in banana meat were below 0.046 mg·kg-1,which was less than the maximum residue limit(MRL) of difenoconazole in banana stipulated by China(1.0 mg·kg-1).Bagging can significantly reduce the residue of difenoconazole in banana and improve the exterior quality such as the appearance of banana