Abstract
In order to examine the persistence behavior, safety evaluation and utilization of residue data for fixation of thiacloprid MRL, a supervised field trial in tea was conducted at Darjeeling. The HPLC analysis of thiacloprid in green tea leaves indicates that the initial deposits of 2.14 and 3.95mgkg(-1), which declined gradually and persisted until day 14 to the tune of 0.23 and 0.45mgkg(-1) respectively. The residues in processed tea samples prepared from green tea leaves of 7 and 14th day were 3.0-3.8times less. Thiacloprid did not infuse to tea liquor from processed tea. The half-life value in green tea leaves ranged from 4.29 to 4.31days. Considering the EU MRL value of 10mgkg(-1) and risk assessment calculation, thiacloprid at 30ga.i.ha(-1) appears to be safe in plant protection schedules and first round of plucking of green tea leaves on day 7 is recommended.
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