Residue Dynamics of Difenoconazole in Pear and Soil and Its Safety Evaluation

A field experiment was conducted to reveal residue dynamics of difenoconazole 10% WG in pear and soil. The result shows that difenoconazole degraded rapidly in the pear, but lowly in the soil relatively. The half-life of difenoconazole in the former was 5.66-7.27 d and in the latter was 10.01-19.69 d. Results of the two-year experiment shows when the pear was sprayed 3 to 4 times with 167 and 334 mg/kg, difenoconazole 10% WG, and the last application was done 14 d before harvesting, the residue of difenoconazole in the harvested pear was lower than 0.2 mg/kg, demonstrating that it is safe to apply difenoconazole to pear with the recommended rate.