BACKGROUND: The healthy food trend is encouraging the comsumption of natural products, inculuding berries. This trend is expected to increase the strawberry consumption. Strawberreis is possible to increse exposure to pesticides and people concerned about their exposure. In this study, diissipation patterns of systemic and nonsytemic pesticides were evaluated in strawberry under plastic-covered greenhouse conditions.
METHODS AND RESULTS: Cyflumetofen and dimethomorph was applied to the critical GAP on strawberry. Strawberry were harvested at 0, 1, 2, 3, 5, 7 and 10 days after final application. The residue analysis methods are performed by HPLC-DAD with C18 column. The limit of quantitation(LOQ) of cyflumetofen and dimethomorph was 0.04 and 0.02 mg/kg. The recovery levels of cyflumetofen and dimethomorph was 88.1 ~ 103.3% and 79.0 ~ 110.2% for spiked two levels(LOQ and 10LOQ). The biological half-lives of cyflumetofen and dimethomorph was 7.5 and 8.9 days. The dissipation rates were evaluated according to the statistics method with a 95% confidence.
CONCLUSION: The residues of cyflumetofen and dimethomorph in strawberry at 0 days after final application were below specified by Korean MRL. As compared to the previous case, dissipation of systemic and non-systemic pesticides depends on the log Pow and water solubility. By understanding the parameters for dissipation, it is useful to predict the pathway of reduction of pesticide under field conditions.