Recovery of pitted morningglory (Ipomoea lacunosa) and ivyleaf morningglory (Ipomoe hederacea) following applications of acifluorfen, fomesafen, lactofen
1988
Higgins, J.M. | Whitwell, T. | Murdock, E.C. | Toler, J.E.
Field experiments were conducted during 1985 and 1986 to determine the response of soybean [Glycine max (L.) Merr. 'Coker 156'], pitted morningglory (Ipomoea lacunosa L. #3 IPOLA), and ivyleaf morningglory [Ipomoea hederacea (L.) Jacq. #IPOHE] to acifluorfen (5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid), fomesafen (5-[2-chloro-4-(trifluoromethyl)phenoxy]-N-(methylsul-fonyl)-2-nitrobenzamide), and lactofen [(+/-)]-2-ethoxy-1-methy-2-oxoethyl-5-[2-chloro-4-(trifluromethyl)phenoxy]-2-dinitrobenzoate). Acifluorfen and lactofen were more phytotoxic to soybean 15 days after treatment (DAT) than fomesafen. All herbicides at low rates controlled 80% or more pitted morningglory. However, only the high rates (0.6 kg ai/ha) of acifluoren and fomesafen controlled 80% or more ivyleaf morningglory 90 DAT. Full-season competition from untreated pitted morningglory reduced soybean seed yields 44 and 22% in 1985 and 1986, respectively, compared to 58 and 49% with untreated ivyleaf morningglory. Soybean seed yields were higher in plots receiving acifluorofen or fomesafen applications than lactofen applications.
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