The Basis for Bentazon Selectivity in Navy Bean, Cocklebur, and Black Nightshade

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Abstract
The trifoliate leaf of tolerant navy bean (Phaseolus vulgarisL.) retained less bentazon [3-isopropyl-1H-2,1,3-benzothiadiazin-(4)3H-one 2,2-dioxide] from foliar applications than the unifoliate leaf, or the leaves from susceptible cocklebur (Xanthium pensylvanicumWallr.) and moderately susceptible black nightshade (Solarium nigrumL.) seedlings. The14C from14C-bentazon applied to the foliage of black nightshade moved throughout the entire plant. In cocklebur, the14C moved throughout the treated leaf, whereas, in the trifoliate leaf of navy bean, very little acropetal movement occurred from the site of application. However, in the unifoliate leaf of navy bean, acropetal and basipetal movement of14C from the leaf was observed. The species differed in the14C-metabolites formed from14C-bentazon 1 and 5 days after treatment. The rapid metabolism of bentazon in the trifoliate leaf of navy bean appears to be related to tolerance.