RESIDUES OF QUINTOZENE, ITS CONTAMINANTS AND METABOLITES IN SOIL, LETTUCE, AND WITLOFF-CHICORY, BELGIUM 1969-74

  • 1 January 1976
    • journal article
    • research article
    • Vol. 10  (2) , 68-73
Abstract
Contamination of soils used to raise lettuce in greenhouses and witloof-chicory (French endive) in forcing beds was studied. The crops had been treated with the fungicide quintozene [used to control Rhizoctonia bottom rot and Botrytis gray mold rot]; residues detected included quintozene, its technical impurities and metabolites hexachlorobenzene, pentachlorobenzene, pentachloroaniline and pentachlorothioanisole. Analyses of 72 soil samples indicated that soils remain contaminated with these chemicals 1 or more years after application. This is attributed to the high persistence of quintozene, its impurities and metabolites, and the almost annual application of the fungicide. Analyses of the crops show that quintozene, hexachlorobenzene, and pentachloroaniline are taken up from contaminated soils, especially by lettuce. Pentachlorothioanisole, although present in the soils, was not detected in the crops.

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