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Abstract
Field study was conducted to study the magnitude of foltap residues in betelvine leaves. Betel leaves were treated with foltap (80% W. P.) at 1.6 kg and 3.2 kg a.i./ha and four sprayings were done at the interval of 15 days. The samples of betel leaves were drawn at different time intervals and analysed by gas chromatography, after necessary extraction and cleanup. It was found that the initial residues of foltap varied from 35.0–40.0 ppm which dissipated to 7.0–9.2 ppm in betel leaves even after 14 days of each application at the recommended dose (1.6 kg. a.i./hac). It was also revealed that after thorough washing with water, the foltap residue remains at 0.23 ppm 14 days even after the fourth spraying at the recommended dose, which is above the recommended ADI value.