The Degradation Patterns of Three Pesticides in Perilla Leaf by Cultivation, Storage and Washing

Three pesticides commonly used in perilla leaf were subjected to a field residue trial to ensure safety of terminal residues in the harvest. The residual patterns of three pesticides, which were dimethomorph, indoxacarb and procymidone were examined after applying with the recommended and double dose and their DT50 were calculated. Also degradation patterns of pesticides at storage were compared to those at , and removal rates of pesticides by washing perilla leaf with water were measured. Biological half-lives of dimethomorph, indoxacarb and procymidone were days, respectively. During the storage period, the degradation patterns were appeared more obviously at than . Removal rates of dimethomorph, indoxacarb and procymidone were by various washing methods.