RESIDUES OF MANCOZEB, MANEB AND ETHYLENETHIOUREA IN FUNGICIDE-TREATED FIELD AND GREENHOUSE TOMATOES

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Abstract
Residues of the ethylenbisdithiocarbamate (EBDC) fungicides maneb and mancozeb on tomato fruits ranged between 0.03 and 0.80 ppm (mean 0.31 ppm) when field crops were sprayed five or eight times at intervals of 3–4 days. Ethylenethiourea (ETU) was detected only in one sample, at 0.03 ppm. In canned juice made from whole fruit, EBDC levels ranged from non-detectable to 0.62 ppm (mean 0.31 ppm) and ETU levels from non-detectable to 0.07 ppm (mean 0.02 ppm). These levels were generally higher than in canned peeled fruit where the range of EBDC was from non-detectable to 0.27 ppm (mean 0.09 ppm) and of ETU from non-detectable to 0.05 ppm (mean 0.01 ppm). On greenhouse tomatoes, two or four sprays with mancozeb resulted in residues of up to 2.81 ppm EBDC (mean 0.714 ppm) and 0.08 ppm ETU (mean 0.0097 ppm) on the fruit. All levels of EBDC were below the Canadian tolerance level of 4 ppm but ETU is unacceptable in food in Canada.

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