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Preharvest Applications of Glyphosate for Yellow Toadflax (Linaria vulgaris) Control

Published online by Cambridge University Press:  12 June 2017

Mirza N. Baig ,
A. Lloyd Darwent ,
K. Neil Harker  and
John T. O'Donovan
Mirza N. Baig*
Affiliation:
Monsanto Canada Inc., Edmonton, AB, Canada
A. Lloyd Darwent
Affiliation:
Agriculture and Agri-Food, P.O. Box 29 Beaverlodge, AB, Canada TOH OCO
K. Neil Harker
Affiliation:
Agriculture and Agri-Food, 6000 C
John T. O'Donovan
Affiliation:
E Trail, Lacombe, AB, Canada T4L 1W1
*
Corresponding author's E-mail: mnbaig@telusplanet.net.
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Abstract

The effectiveness of preharvest applications of glyphosate on yellow toadflax was evaluated at five sites in Alberta from 1992 to 1994. At each site, glyphosate at 0.9 to 1.8 kg ae/ha was applied with or without nonionic surfactant and/or ammonium sulfate. Glyphosate at 2.7 kg/ha and glufosinate at 0.6 kg ai/ha were applied without additional adjuvants. The treatments were applied 7 to 10 d before crop harvest, when the majority of the yellow toadflax was in a flowering stage. Eleven to 12 mo after glyphosate application, yellow toadflax density was reduced by more than 80%. In most instances, there was no advantage in increasing the glyphosate rate above 0.9 kg/ha. The addition of nonionic surfactant and/or ammonium sulfate did not enhance glyphosate activity. Glufosinate did not control yellow toadflax in the year following treatment. Barley, canola, and flax yields in the year following applications were significantly higher in all preharvest glyphosate-treated plots than in untreated plots.

Keywords

Glyphosate, N-(phosphonomethyl) glycineglufosinate, 2-amino-4-(hydroxymethylphosphinyl)butanoic acidyellow toadflax, Linaria vulgaris Mill. ♯ LINVUbarley, Hordeum vulgare L.canola, Brassica rapa L. Em. Metzgflax, Linum usitatissimum L.lentil, Lens culinaris L.pea, Pisum sativum var. arvense L.wheat, Triticum aestivum L.Surfactantsammonium sulfateglufosinatecrop drydownLINVU
Type
Research
Information
Weed Technology , Volume 13 , Issue 4 , December 1999 , pp. 777 - 782
Copyright
Copyright © 1999 by the Weed Science Society of America 

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Footnotes

Current address of senior author: Agricultural Consultant, Consulting Options Inc., 5827-181 Street, Edmonton, AB, Canada T6M 1V7.

References

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