In order to investigate changes of pyraclostrobin and its metabolite BF 500-3 residues in spinach and Korean cabbage under greenhouse conditions, the test pesticide (11% SC) was diluted by 2,000 times with ground water and then sprayed three times with a 7-day interval. Application was done at different days (28-21-14, 21-14-7. 17-10-3, and 14-7-0 days) before harvest and then samples were collected on the prearranged days of harvest. The residues of the test pesticide and its metabolite were analyzed with an LC-MS/MS. Limits of quantitations of pyraclostrobin and its metabloite BF 500-3 were 0.06 and 0.02 for spinach and 0.03 and 0.01 mg/kg for Korean cabbage, respectively. The recoveries of pyraclostrobin in spinach and Korean cabbage were 85.3-95.6 and 74.3-88.3 and those of BF 500-3 were 81.1-98.4 and 73.0-87.9%, respectively. Average total residues (sum of pyraclostrobin and BF 500-3 residues) as treated three times with a 7-day interval at 14, 7, 3 and 0 days before harvest were 0.29, 0.82, 1.90 and 2.08 mg/kg for spinach and 0.50, 0.77, 0.99 and 1.20 mg/kg for Korean cabbage, respectively. These results represented that the amounts of pyraclostrobin residues in the test crops were higher as spraying closer to the harvest day.

Changes of pyraclostrobin and its metabolite BF 500-3 residues in spinach and Korean cabbage

256th National Meeting (2018)

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