Degradation Kinetics and Safety Constants of a New Formulation of Mancozeb in Potato and Tomato

Persistence of mancozeb (new formulation 75 WDG) was studied under field conditions in West Bengal, India in tomato and potato crop following foliar spray application @ 750 and 1500 g ai ha’. Residues were determined after 3 sprays of mancozeb applied as per the good agricultural practices. Mancozeb residues were below detectable limits on the 5thday for the recommended dose and 7th day for double the recommended dose. The suggested waiting period ranged between 4 to 5 days for potato tuber and 5–6 days for tomato fruits. The half-life values varied from 1.2–1.3 days for the foliages of these vegetables as well as fruits and tubers.