MANCOZEB RESIDUES IN HIGHLAND AND LOWLAND TOMATOES

U.B. CHEAH

Abstract

There was no significant dissipation of mancozeb residues from treated tomatoes until about two weeks after treatment. The same pattern of residue dissipation was observed for lowland and highland tomatoes at the manufacturers' recommended application rate of 0.2% a.i. and at a higher dosage of 0.4% active ingredient. Residue problem is not likely to arise if a pre-harvest interval of two weeks is followed. Washing removed 48% - 90% of initial residues while boiling under reflux removed a further 12% - 79% of the remaining residues.

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