Dissipation of Propham and Chlorpropham Residues in Potato Tubers, Peel and Pulp

Residues of propham and chlorpropham when applied @ 60 ml ton⁻¹ (propham and chlorpropham mixture 29%) were determined in the samples collected 2, 7 and 21 d after treatment. The residues of propham remained below detectable level in whole potato tubers, potato peels and potato pulps, whereas, residues of chlorpropham were found in maximum amounts in potato peel followed by whole potato and pulp. Average residues of chlorpropham were 4.69, 0.50 and 0.085 μg g⁻¹ in 2 d samples of potato peel, whole potato tubers and pulp respectively, which dissipated to 2.61, 0.15 and 0.032 μg g⁻¹ within 21 d of treatment. Peeling of potato substantially reduced the residues.