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Glyphosate Translocation and Quackgrass Rhizome Bud Kill

Published online by Cambridge University Press:  12 June 2017

J. S. Claus  and
R. Behrens
J. S. Claus
Affiliation:
Dep. of Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
R. Behrens
Affiliation:
Dep. of Agron. and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108
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Abstract

The effect of quackgrass [Agropyron repens (L.) Beauv.] rhizome length and foliage height on glyphosate [N-(phosphonomethyl)glycine] translocation was determined on the basis of bud kill and 14 C-accumulation in quackgrass rhizomes. Foliar glyphosate treatments of 0.28 kg/ha resulted in significantly reduced quackgrass rhizome bud survival, and rates of 0.56, 0.84, and 1.12 kg/ha gave nearly complete bud kill. Rhizome buds on glyphosate-treated quackgrass plants with 20 to 90 nodes had a higher survival rate than rhizome buds on plants with 10 nodes. Quackgrass bud kill was greatest when glyphosate was applied to taller foliage. When all rhizome buds were not killed, those closest to the mother shoot survived glyphosate treatments. The 14C accumulation following applications of 14C-glyphosate was greatest in nodes near the rhizome tip and least in nodes near the mother shoot. This suggests that greater bud kill near the rhizome tip was due to larger accumulation of glyphosate in this part of the rhizome.

Type
Research Article
Information
Weed Science , Volume 24 , Issue 2 , March 1976 , pp. 149 - 152
Copyright
Copyright © 1976 by the Weed Science Society of America 

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References

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