Carbofuran 3G and aldicarb 10G when applied to one year old betelvine crop at 0.5, 1.0 kg ai/ha each dissipated to non-detectable levels in 41 days. The half life. values were 6 and 7 days respectively for carbofuran and aldicarb in betel leaves.. While the aldicarb application required a waiting period of 12 to 14 days, carbo- furan required a waiting period 13 to 15 days for safe chewing of betal leaves. Ziram dissipated, faster than copper oxychloride and the half-life values were 5. and 8 days respectively. Ziram applled as 0.2% spray and copper oxychloride sprayed at 0.25% concentration to betelvine crop required 4.3 days and one day respectively as waiting period for the safe chewing of botel leaves.
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Tamil Nadu, India.
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