Residues of Dacthal and its monoacid and diacid hydrolytic ester cleavage metabolites were determined in carrots to which the herbicide was applied on seven plot locations throughout the United States. Residue levels of Dacthal appeared more closely related to the rate of application than to other field parameters. Traces of the monoacid metabolite were found in a few samples. The diacid metabolite was not detected in any of the samples.