Influence of Selected Fungicides on Efficacy of Clethodim and Sethoxydim

• Published in: Weed technology 2005-05, Vol.19 (2), p.397-403
• Main Authors: Lancaster, SH, Jordan, D L, York, A C, Burke, I C, Corbin, F T, Sheldon, Y S, Wilcut, J W, Monks, D W
• Format: Article
• Language: English
• Subjects: Arachis hypogaea; Digitaria sanguinalis
• ISSN: 0890-037X
• DOI: 10.1043/0890-037X(2005)019[0397:IOSFOE]2.0.CO;2

Field experiments were conducted to compare large crabgrass control by clethodim or sethoxydim applied alone and with selected fungicides registered for use in peanut. Fluazinam, propiconazole plus trifloxystrobin, or tebuconazole did not affect efficacy of clethodim or sethoxydim. Azoxystrobin, boscalid, chlorothalonil, and pyraclostrobin reduced efficacy of clethodim and sethoxydim in some experiments. Increasing the herbicide rate increased large crabgrass control regardless of the addition of chlorothalonil. In laboratory experiments, super(14)C absorption was less when super(14)C-clethodim or super(14)C-sethoxydim was applied with chlorothalonil. Pyraclostrobin and tebuconazole did not affect absorption of super(14)C-clethodim or super(14)C-sethoxydim.Nomenclature: Azoxystrobin, methyl (E)-2-[2-[6-(2-cyanophenoxy)pyrimidin-4-yloxy]phenyl]-3-methoxy acrylate; boscalid, 3-pyridinecarboxamide,2-chloro-N-[4'-chloro(1,1'-biphenyl)-2-yl ]; chlorothalonil, tetrachloroisophthalonitrile; clethodim; fluazinam, 3-chloro-N-[3-chloro-2,6-dinitro-4-(trifluoromethyl)phenyl]-5-( trifluoromethyl)-2-pyridinamine; propiconazole, 1-[2-(2,4-dichlorophenyl)-4-propyl-1,3-dioxolan-2-yl-methyl]-1H -1,2,4triazole; pyraclostrobin, carbamic acid,[2-[[[1-(4-chlorophenyl)-1H-pyrazol-3yl]oxy]methyl]phenyl] methoxy-,methyl ester; sethoxydim; tebuconazole, alpha -[2-(4-chlorophenyl)ethyl]- alpha -(1,1-dimethylethyl)-1H-1,2,4-tr iazole-1-ethanol; trifloxystrobin, benzeneacetic acid, alpha -(methoxyimino)-2-[[[(E)-[1-[3-(trifluoromethyl)phenyl]ethyli dene]amino]oxy]methyl]-,methylester (E,E); large crabgrass, Digitaria sanguinalis (L.) Scop. NUMBER SIGN DIGSA; peanut, Arachis hypogaea L.Additional index words: Herbicide absorption, pesticide interaction.Abbreviation: LSS, liquid scintillation spectrometry.