Abstract
Residues of imidacloprid were estimated in grape leaves, grape berries and soil following four applications of Confidor 200SL at 400 and 800 mL ha−1 using 1,000 L water. The average initial deposits of imidacloprid on grape leaves were found to be 10.01 and 16.97 mg kg−1 at single and double dosages, respectively. These residues of imidacloprid dissipated to be the extract of 98.8% and 97.0%, respectively, at single and double dosages in 15 days, with half-life period of 2.35 and 2.97 days. Residues of imidacloprid in grape berries at harvest time were observed to below determination limit of 0.05 mg kg−1 at single dose and 0.06 mg kg−1 at double dose. However, acceptable daily intake (ADI) of imidacloprid is 0.06 mg kg−1 body weight day−1, which means an adult of 60 kg and a child of 10 kg can safely tolerate intake of 3,600 and 600 μg imidacloprid, respectively, without any appreciable risk to their life. Assuming consumption of 200 g grape berries contaminated at 0.06 mg kg−1, it will lead to an intake of only 12 μg of imidacloprid, which is quite safe for a child as well as for an adult. Hence, the use of imidacloprid on grape crop seems to be toxicologically acceptable.
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Authors thanks the Director, PAU Regional Research Station Abohar and the Head, Department of Entomology for providing the necessary research facilities during the tenure of the study.
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Arora, P.K., Jyot, G., Singh, B. et al. Persistence of Imidacloprid on Grape Leaves, Grape Berries and Soil. Bull Environ Contam Toxicol 82, 239–242 (2009). https://doi.org/10.1007/s00128-008-9554-y
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DOI: https://doi.org/10.1007/s00128-008-9554-y