Abstract
Abstract Tomato (Lycopersicum esculentum Mill., ‘Heinz 1350'), a crop plant susceptible to both herbicides used, readily absorbed root‐fed 3‐(p‐bromophenyl)‐l‐methoxy‐l‐methylurea (metobromuron) and 3‐(4‐bromo‐3‐chlorophenyl)‐l‐methoxy‐l‐methylurea (chlorbromuron) and translocated them to the foliage. The umbelliferous crop plants, carrot (Daucus carota L., ‘Gold Pak') and coriander (Coriandrum sativum L.)., both moderately susceptible and resistant to metobromuron and chlorbromuron respectively, absorbed and translocated metobromuron to the foliage but chlorbromuron, although found in the roots of these plants in high concentration, was not translocated upward appreciably. Neither herbicide applied to the leaves was translocated away from the area of application in significant amounts in either tomato or coriander. The thin layer chromatography of extracts from the various plant parts indicated that neither compound was metabolized appreciably by the resistant coriander. Extracts from roots and tops of t...
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