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Rate of degradation of  -cyhalothrin and methomyl in grapes ( Vitis vinifera L.)

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Rates of degradation of -cyhalothrin and methomyl residues in grape are reported. The dissipation behavior of both insecticides followed first-order rate kinetics with similar patterns at standard and double-dose applications. Residues of -cyhalothrin were lost with pre-harvest intervals (PHI) of 12.0–12.5 and 15.0–15.5 days, corresponding to the applications at 25 and 50g a.i. ha −1 , respectively. In the case of methomyl, residues were lost with PHI of 55.0 and 61.0 days, following applications at 1 and 2kg a.i. ha −1 , respectively. The PHI, recommended on the basis of the experimental results, was shown to be effective in minimizing residue load of these insecticides below their maximum residue limits (MRLs) in vineyard samples.
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Keywords: Grape; dissipation; lambda-cyhalothrin; methomyl; pre-harvest interval; residue

Document Type: Research Article

Affiliations: National Research Centre for Grapes, P. O. Manjri Farm, P. B. No. 3, Solapur Road, Pune, 412 307, Maharashtra, India

Publication date: October 1, 2006

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