Dissipation pattern and accumulation of Lambda-Cyhalothrin and Beta-Cyfluthrin in Tomato

The dissipation pattern and accumulation of lambda-cyhalothrin and beta-cyfluthrin in the harvested tomato fruits were studied at All India Network Project (AINP) on Pesticide Residue Laboratory, College of Agriculture, Rajendranagar, Hyderabad. The initial deposit of lambda-cyhalothrin, beta-cyfluthrin (0.15 and 0.21mg kg⁻¹) were observed to dissipate to 0.03 mg kg⁻¹ and Below Detected Level by 10^th day after first spray, respectively; the half life values of these were 22.97 and 14.90 days, respectively. Accumulation pattern revealed that after third spray, maximum initial deposit was at 0.55 mg kg⁻¹ beta-cyfluthrin followed by lambda-cyhalothrin (0.53 mg kg⁻¹). The safety intervals of lambda-cyhalothrin was observed to be 4.8 and 5.2 days for first and third sprays, while it was 1.2 days at first and 4.8 days at third spray with beta-cyfluthrin.