Interaction of Fluometuron and MSMA with Sethoxydim and Fluazifop

• Published in: Weed science Vol. 35; no. 2; pp. 270 - 276
• Main Authors: Byrd, John D., York, Alan C.
• Format: Journal Article
• Language: English
• Published: Cambridge, UK Cambridge University Press 01-03-1987; Weed Science Society of America
• Subjects: Bolls; CHEMICAL CONTROL; CONTROL QUIMICO; Cotton; Crops; DESHERBAGE; ESCARDA; GOSSYPIUM HIRSUTUM; Grasses; HERBICIDAS; HERBICIDE; HERBICIDES; LUTTE CHIMIQUE; Perceptual localization; Sandy loam soils; Soil organic matter; Storage tanks; Surfactants; WEED CONTROL; Weed Control and Herbicide Technolgy; Weed Control and Herbicide Technology; DIGSA; tank mixtures; Antagonism; Digitaria sanguinalis; Gossypium hirsutum; sequential applications
• ISSN: 0043-1745; 1550-2759
• DOI: 10.1017/S0043174500079182

Field experiments were conducted to determine the effects of tank-mixing fluometuron {N,N-dimethyl-N′-[3-(trifluoromethyl)phenyl] urea} or MSMA (monosodium salt of methylarsonic acid) with sethoxydim {2-[1-(ethoxyimino)butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-one} or the butyl ester of fluazifop {(±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy] phenoxy] propanic acid} on cotton (Gossypium hirsutum L.) tolerance and large crabgrass [Digitaria sanguinalis (L.) Scop. # DIGSA] control. Postemergence (over-the-top) application of 1.7 kg ai/ha of fluometuron reduced cotton lint yield 17 to 23% in three of four tests. No yield reduction resulted from postemergence application of 1.1 kg ae/ha of MSMA. Tank-mixing 0.1 or 0.2 kg ai/ha of sethoxydim or 0.1 or 0.2 kg ae/ha of fluazifop with fluometuron or MSMA did not alter the effect of fluometuron or MSMA on cotton yield. Tank mixtures of 1.1 to 2.2 kg/ha of fluometuron plus sethoxydim or fluazifop were antagonistic. No antagonism was observed when fluometuron was applied 3 days before or 6 h following sethoxydim or fluazifop application. Tank-mixing 1.1 or 2.2 kg/ha of MSMA with sethoxydim or fluazifop initially reduced control of large crabgrass. Antagonism was not observed at 4 weeks after tank-mix application of MSMA plus sethoxydim, and was observed in only one of three experiments 4 weeks following tank-mix application of MSMA plus fluazifop. When antagonism was observed with tank mixtures of fluazifop plus MSMA, sequential application of MSMA 1 to 7 days before application of fluazifop did not overcome the antagonism. No antagonism occurred when MSMA was applied 6 or more hours after fluazifop application.