Half-life values for total mancozeb residues on tomato leaves and soil were measured to be 9.5 and 7.6 days respectively. Leaching of residual mancozeb in soil was observed. Mancozeb deposition on the fruit skin

and in particular the water-soluble metabolites like ETU（ethylene thiourea） transferred throughout the plants would be the main sources of contamination of tomato fruits. The fruit skin contained higher levels of residue than the pulp

and by washing with water more than 50% of the residue could be removed. It was also found that 20-30% of the residual mancozeb degraded to ETU during cooking process.