Residue Dynamics of Flusilazole in Cucumber and Soil

A supervised trial was done to evaluate dissipation of fungicide flusilazole in either cucumber or in soil at application of doses of 75 g (a.i.)· hm-2 and 150 g (a.i)·hm-2, respectively. Both plant and soil samples were extracted by acetone and petroleum ether, passing through a florisil column and followed by portioning with 35% acetone in petroleum ether for clean-up.The extract was determined by using Bpx-50 capillary column (stationary phase: 50% phenyl (eguiv.) polysil phenylene-siloxane) and N-P detector. Recoveries of flusilazole in spiked cucumber and soil samples were in ranges of 93%- 101%, 102%-105%, respectively. It was found that the final resides were 0.04-0.196 mg·kg-1 in cucumber and 0.055-0.307 mg·kg-1 in soil during 1999, 0.173-0.719 mg·kg-1 in cucumber and 0.143-0.434 mg·kg-1in soil in 2000, respectively. The half-lives of flusilazle in soil and cucumber were 11-13 days and 2-3 days, respectively.