ABSORPTION, TRANSLOCATION AND METABOLISM OF DICHLOBENIL IN BEAN SEEDLINGS

Summary. A quantitative study was carried out on the absorption, translocation and metabolism of 2,6–dichlorobenzonitriie‐14G (dichlobenil) in seedlings of Phaseolus vulgaris L. From an aqueous solution dichlobenil is absorbed by the roots and accumulates about three‐fold; metabolism in the roots is of minor importance. From the roots the herbicide is translocated throughout the plant. In the leaves two competitive processes take place: the main part (90%) of the dichlobenil evaporates and another part is metabolized. The principal metabolic pathway is hydroxylation, followed by conjugation, 3–hydroxy‐2,6–clichlorobenzonitriIe and 4–hydroxy‐2,6–dichlorobenzonitrile analogues being formed in a ratio of about 4:1. Hydrolysis of dichlobenil into 2.6–dichlorobenzamide and 2,6–dichlorobcnzoic acid is only a minor metabolic route. From a saturated atmosphere dichlobenil is taken up rapidly through the leaves but little translocation occurs to the roots. Following foliage application more of the applied dichlobenil Is metabolized because evaporation of dichiobenil as a competitive process is virtually eliminated. Absorption, migration ei métabolisme du dichlobenil dans les plantules de haricot Copyright © 1969, Wiley Blackwell. All rights reserved