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Short-Term Split Application Effects of Grass-Specific Herbicides on Quackgrass (Elytrigia repens) Under Field Conditions

Published online by Cambridge University Press:  12 June 2017

K. Neil Harker
K. Neil Harker*
Affiliation:
Agric. and Agri-Food Canada, Lacombe Research Centre, 6000 C&E Trail, Lacombe, Alberta, Canada T4L 1W1
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Abstract

Field experiments were conducted at the Lacombe Research Station from 1989 to 1991 to determine if short-term, split applications of grass-specific herbicides would improve quackgrass control relative to single applications. Quackgrass infested plots were planted to canola the first year and barley the following year. Glyphosate applied at 880 g/ha controlled quackgrass to a greater extent and for a longer time period than any of the grass-specific herbicides. In contrast to glyphosate, none of the grass-specific herbicides controlled quackgrass 1 yr after treatment. Quackgrass control with sethoxydim or fluazifop-P was usually similar when applied as single or short-term, split applications. In contrast, quizalofop often provided better quackgrass control and higher crop yields when short-term, split applications were compared to a single application with the same total amount of quizalofop. However, the extent of increased quackgrass control is difficult to justify due to increased application costs and inconvenience.

Keywords

Fluazifop-P, (R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]oxy]phenoxy]-propanoic acidglyphosate, N-(phosphonomethyl)glycinequizalofop, (±)-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 # AGRREbarley, Hordeum vulgare L. ‘Leduc’canola, Brassica rapa L. ‘Tobin.’Fluazifop-PglyphosatequizalofopsethoxydimAgropyron repensAGRRE
Type
Research
Information
Weed Technology , Volume 9 , Issue 4 , December 1995 , pp. 710 - 715
Copyright
Copyright © 1995 by the Weed Science Society of America 

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