Absorption, translocation, and metabolism of foliar-applied chlorimuron in soybeans (Glycine max), peanuts (Arachis hypogaea), and selected weeds
1989
Wilcut, J.W. | Wehtje, G.R. | Patterson, M.G. | Cole, T.A. | Hicks, T.V.
Tolerance of species to foliar applications of the ethyl ester of chlorimuron as determined in greenhouse studies with 21-day-old seedlings was: soybean = peanut greater than prickly sida greater than sicklepod greater than Florida beggarweed greater than common cocklebur. Absorption of foliar-applied 14C-chlorimuron 72 h after application was similar in soybean, peanut, sicklepod, common cocklebur, and prickly sida, but much less in Florida beggarweed. Slight symplasmic and apoplasmic translocation of the herbicide was evident in all species. Metabolism of chlorimuron 72 h after application was greatest in soybean and least in common cocklebur. Species tolerance to chlorimuron was directly correlated (r2 = 0.93) to the amount of unmetabolized chlorimuron (dpm/g dry wt) in the plant. Peanut exhibited increased tolerance to chlorimuron with age; this result was attributed to reduced absorption and translocation and more extensive metabolism of the absorbed herbicide by older plants.
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