In greenhouse studies, postemergence applications of 0.1 or 0.3 kg ai/ha mefluidide {N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl] amino] phenyl] acetamide} as a tank mixture with 0.3, 0.4, or 0.6 kg ai/ha acifluorfen {5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid}, or as a pretreatment 3, 5, or 7 days prior to acifluorfen treatment, often increased injury to ivyleaf morningglory [Ipomoea hederacea(L.) Jacq. ♯3IPOHE], velvetleaf (Abutilon theophrastiMedic. ♯ ABUTH), and common cocklebur (Xanthium pensylvanicumWallr. ♯ XANPE), compared to the injury from either herbicide alone. All sequential treatments with 0.1 kg ai/ha mefluidide and 0.3 kg ai/ha acifluorfen increased injury and decreased dry weight of ivyleaf morningglory and velvetleaf when compared with 0.6 kg/ha acifluorfen alone.

The penetration, translocation, and metabolism of acifluorfen {5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid} in ivyleaf morningglory [Ipomoea hederacea(L.) Jacq. ♯3IPOHE], velvetleaf (Abutilon theophrastiMedic. ♯ ABUTH), common cocklebur (Xanthium pensylvanicumWallr. ♯ XANPE), and soybean [Glycine max(L.) Merr.] were studied. An application to plants of 0.3 kg ai/ha mefluidide {N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl] amino] phenyl] acetamide} 0, 3, 5, or 7 days prior to treatment with14C-acifluorfen often altered one or more of the physiological processes under study. Pretreatment of ivyleaf morningglory with mefluidide 3, 5, or 7 days prior to application of14C-acifluorfen increased penetration of14C and decreased metabolism of acifluorfen, while translocation was unaffected. All mefluidide treatments increased penetration of14C-acifluorfen into velvetleaf, while the 3-, 5-, and 7-day pretreatments decreased acifluorfen metabolism. Penetration of acifluorfen into common cocklebur was unaffected by pretreatment with mefluidide. However, the 7-day mefluidide pretreatment of common cocklebur increased translocation of14C into the upper leaves and decreased acifluorfen metabolism. Penetration and translocation of the radiolabel from14C-acifluorfen in soybean was unaffected by pretreatment with mefluidide. Metabolism of acifluorfen by soybean was decreased by the 0-day mefluidide treatment but was unaffected by the 3-, 5-, or 7-day mefluidide pretreatment.

Single and sequential applications of mefluidide {N-[2,4-dimethyl-5-[[(trifluoromethyl)sulfonyl] amino] phenyl] acetamide} and acifluorfen {5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid} were evaluated in the field for velvetleaf (Abutilon theophrastiMedic. ♯ ABUTH) and common cocklebur (Xanthium pensylvanicumWallr. ♯ XANPE) control in soybeans [Glycine max(L.) Merr. ‘Williams’]. Acifluorfen was applied at 0.4 or 0.6 kg ai/ha alone or 3, 5, or 7 days following application of 0.1 or 0.3 kg ai/ha mefluidide. Acifluorfen applied alone provided acceptable control of velvetleaf and common cocklebur in the two- and three-leaf stage of growth, but acifluorfen was not as effective when applied to weeds with five to eight true leaves. Sequential applications of mefluidide and acifluorfen often increased velvetleaf and common cocklebur control, compared to either herbicide applied alone.

Summary: Résumé: Zusammenfassung Separate field experiments were conducted to evaluate Sorghum halepense (L.) Pers. (johnson‐grass) control with foliar‐applied herbicides in soyabeans (Glycine max (L.) Merr. cv. Williams) grown in tilled (mould board plough) or no‐tillage fields. Fluazifop‐butyl, sethoxydim, CGA‐82725 and mefluidide were applied post‐emergence to 45‐cm high S. halepense and glyphosate was applied with a wick bar to 90‐cm high S. halepense in the conventional and no‐tillage studies. HOE‐00581 {ethyl 2‐[4‐[(6‐chloro‐2‐benzoazolyl)oxyl]‐phenoxy]propanoate} was applied to 45‐cm high S. halepense only in the no‐tillage studies. Fluazifop‐butyl, sethoxydim, CGA‐82725, HOE‐00581 (no‐tillage only) and glyphosate provided good control of S. halepense in conventional and no‐tillage soyabeans and generally increased soyabean yields compared to weedy controls, when low precipitation was not limiting yields. Mefluidide at 0.3 kg ai ha−1 provided the least S. halepense control in the conventional and no‐tillage studies. The studies were not designed to compare S. halepense control in the two tillage systems; however, these data show that tillage to disrupt S. halepense rhizomes was not required to obtain good control of S. halepense with foliar applications of fluazifop‐butyl, sethoxydim, CGA‐82725, HOE‐00581 and glyphosate. La lutte contre Sorghum halepense (L.) Pers. utilisant des herbicides foliaires dans le soja en culture classique et en non‐culture Plusieurs essais ont été installés sur le terrain dans le but d'évaluer des herbicides foliaires pour la destruction de Sorghum halepense (L.) Pers. dans le soja (Glycine max (L.) Merr. var. Williams) cultivé en terre labourée et en non‐culture. Le fluazifop‐butyle, le séthoxydime, le CGA‐82725 et le méfluidide ont été appliqués en postlevée sur S. halepense haut de 45 cm et le glyphosate a été appliqué sur S. halepense haut de 90 cm, utilisant un frotteur, dans les deux sytèmes de culture. HOE‐00581 (éthyle 2‐[4‐[(6‐chloro‐2‐benzoazolyl)oxyl]phénoxy]propanoate) a été appliqué sur S. halepense haut de 45 cm uniquement dans les systèmes de·non‐culture. Le fluazifop‐butyle, le séthoxydime, le CGA‐82725, le HOE‐00581 et le glyphosate ont bien maitriséS. halepense dans les deux systèmes de culture du soja, tout en augmentant les rendements de soja par rapport au témoin enherbé, là où une précipitation insuffisante n'est pas intervenue. Le méfluidide à 0,3 kg ai ha−1 a donné la plus faible destruction de S. halepense en culture classique et en non‐culture. Une comparaison de la destruction de S. halepense dans les deux systèmes de culture n'était pas le but principal de ces travaux; cependant ces données font voir qu'un labourage pour briser les rhizomes de S. halepense n'est pas de rigueur pour obtenir une bonne maîtrise de l'adventice par des applications foliaires de fluazifop‐butyle, séthoxydime, CGA‐82725, HOE‐00581 et glyphosate. Sorghum halepense (L.) Pers. Bekämpfung mit blattwirksamen Herbiziden in Soyakulturen mit und ohne Bodenbearbeitung Es wurden sepa...

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