Dissipation Pattern of Azoxystrobin, Difenoconazole and Iprodione Treated on Field-Grown Green Garlic
2011
Kang, H.R., Hoseo University, Asan, Republic of Korea | Lee, Y.J., Hoseo University, Asan, Republic of Korea | Lee, Y.R., National Agriculture Product Quality Management Service, Chung-Nam Division Branch Office, Daejeon, Republic of Korea | Han, G.T., National Agriculture Product Quality Management Service, Chung-Nam Division Branch Office, Daejeon, Republic of Korea | Chang, H.R., Hoseo University, Asan, Republic of Korea | Kim, K., Hoseo University, Asan, Republic of Korea
BACKGROUND: To investigate the dissipation patterns of 3 pesticides, azoxystrobin, difenoconazole and iprodione, on green garlic after field treatment pesticides were treated as foliar treatment by single application at recommended and double the recommended rates. METHODS AND RESULTS: Residue samples were harvested at 0, 1, 2, 5, 7 and 10 days post-treatment for azoxystrobin and 0, 1, 2, 5, 7, 10, 15 and 21 days post-treatment for difenoconazole and iprodione. After preparation the fortified samples were extracted and analyzed by gas chromotography-electron capture detector (GC-ECD) to determine the residue levels. Recoveries ranged from 87 to 109% for azoxystrobin, difenoconazole and iprodione at two different levels. The limit of Quantification (LOQ) values were 0.002 mg/kg for azoxystrobin and difenoconazole and 0.01 mg/kg for iprodione. CONCLUSION(S): Half-lives of azoxystrobin, difenoconazole and iprodione in green garlic after treatment were 1.2, 3.8 and 3.2 days at recommended and 1.4, 3.3 and 3.2 at double the recommended rate, respectively. Residue level of azoxystrobin, difenoconazole and iprodione in green garlic were below the maximum residue limits (MRLs) at 0 day, 0 day and 5 days, respectively. Therefore, these pesticide were considered that residues was satisfied to the requirement of domestic trade related to the consumer safety.
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