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Herbicide Comparisons on Quackgrass (Elytrigia repens) Within Different Crop Competition and Tillage Conditions

Published online by Cambridge University Press:  12 June 2017

K. Neil Harker  and
P. A. O'Sullivan
K. Neil Harker
Affiliation:
Agric. Can. Res. Stn., Bag Service 5000, Lacombe, AB, Canada T0C 1S0
P. A. O'Sullivan
Affiliation:
Agric. Can. Res. Stn., Bag Service 5000, Lacombe, AB, Canada T0C 1S0
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Abstract

Five herbicides (cloproxydim, fluazifop, haloxyfop, quizalofop, and sethoxydim) were compared from 1984 to 1988 at 250 and 400 g ha−1 for controlling quackgrass within different crop competition and tillage conditions at the Lacombe Research Station. Crop competition usually augmented quackgrass control with the herbicides in conventional-tillage plots although direct statistical comparisons were not made. Without crop competition, haloxyfop and quizalofop at 250 g ha−1 were more effective than the other herbicides in conventional tillage 1 mo after treatment (MAT). In a conventional-tillage situation on a unit active ingredient basis, the herbicides ranked in order of decreasing activity as follows: quizalofop ≥ haloxyfop > fluazifop > cloproxydim > sethoxydim. In a zero-tillage situation, none of the herbicides reduced quackgrass shoot weights by 50% 3 MAT. However, haloxyfop and quizalofop were more effective in suppressing quackgrass shoot weight than the other herbicides in the zero-tillage experiments 3 MAT.

Keywords

fluazifop, (±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidglyphosate, N-(phosphonomethyl)glycinehaloxyfop, 2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]propanoic acidquizalofop, (±)-2-[4-[(6-chloro-2-quinoxalinyl)oxy]phenoxy]propanoic acidsethoxydim, 2-[1-(ethoxyimino)-butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2-cyclohexen-1-onequackgrass, (Elytrigia repens(L.) Nevski) #3 AGRRE (formerlyAgropyron repens)Zero tillagecloproxydimfluazifopglyphosatehaloxyfopquizalofopsethoxydimAgropyron repensBrassica campestrisHordeum vulgareAGRRE
Type
Weed Control and Herbicide Technology
Information
Weed Science , Volume 41 , Issue 1 , March 1993 , pp. 94 - 99
Copyright
Copyright © 1993 by the Weed Science Society of America 

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