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BACKGROUND:Greenhouse crops are one of agricultural products consumed largely inKorea. Cucumber is a typical example as main vegetables of greenhouse crops. Thus, pesticide residue analysis is an important requirement to guarantee pesticide safety of cucumber. Thisworkwas aim to investigate the residues of penthiopyrad and pyriofenone in cucumber after harvest. METHODS AND RESULTS: Cucumber was subjected to treat with penthiopyrad and pyriofenone at a level of recommendeddose 0, 1, 2, 3, 5, 7 and10days before harvest under greenhouse conditions. The samples were extracted with organic solvent by using a homogenizer and purified on solid phase cartridge column followed by LC-MS/MS analysis. The recovery levels of penthiopyrad and pyriofenoneranged from approximately 81 to 93%with the method limit of 0.005mg/kg andcoefficient of variation less than 10%. Penthiopyrad and pyriofenone were detected at a level less thanmaximumresidue limit in cucumber at 10days before. Thehalf-lives of penthiopyrad andpyriofenonewere determined to 2.4 ~ 2.6 days. CONCLUSION:Penthiopyradandpyriofenoneare suggested to use in cucumber 10 days before harvest to reach their levels less than maximum residue limit.

hanguk hwangyeong nonghak hoeji/han'gug hwan'gyeong nonghag hoeji

Establishment of Pre-Harvest Residue Limits and Residue Characteristics of Penthiopyrad and Pyriofenone in Cucumber (Cucumis sativus L.) Under Greenhouse Condition