Absorption, Translocation, and Metabolism of Acifluorfen and Lactofen in Pitted Morningglory (Ipomoea lacunosa) and Ivyleaf Morningglory (Ipomoea hederacea)

Experiments were conducted to determine14C absorption, translocation, and metabolism by pitted morningglory (Ipomoea lacunosaL. # IPOLA) and ivyleaf morningglory [Ipomoea hederacea(L.) Jacq. # IPOHE] foliarly treated with14C-acifluorfen [5-(2-chloro-4-(trifluoromethyl)phenoxy)-2-nitrobenzoic acid] or14C-lactofen [(±)-2-ethoxy-1-methyl-2-oxoethyl-5-(2-chloro-4-(trifluoromethyl)phenoxy)-2-dinitrobenzoate]. Seventy-one to 84% of applied14C-acifluorfen was recovered in leaf water wash of ivyleaf morningglory compared to 32 to 46% from pitted morningglory. Sixty-four percent of applied14C-lactofen was recovered in leaf water wash 96 h after treatment in both morningglory species. Thirty-five to 37% more14C from applied14C-acifluorfen was found in pitted morningglory treated leaves than ivyleaf morningglory treated leaves. Less than 28% of applied14C-lactofen was extracted from treated leaves of either morningglory species. Translocation and metabolism of14C-acifluorfen and14C-lactofen were minimal in both morningglory species.