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Fall herbicide treatments affect carbohydrate content in roots of Canada thistle (Cirsium arvense) and dandelion (Taraxacum officinale)

Published online by Cambridge University Press:  20 January 2017

An Michiels
Affiliation:
Department of Biology, Botany Institute, Katholieke University, Kardinaal Mercierlaan 92, Heverlee, Belgium

Abstract

Canada thistle and dandelion are troublesome weeds found throughout the northern United States. Carbohydrate concentrations in roots of these plants change in response to freezing temperatures as plants prepare to overwinter. Herbicides applied in the fall provide more effective control of these weeds than does treatment applied in early spring. Experiments were conducted near Scottsbluff, NE, from 1999 to 2001 to examine changes in glucose, fructose, sucrose, and fructans in roots of Canada thistle and dandelion in response to the fall-applied herbicide. Dicamba applied 10 d after the first fall frost reduced the quantities of low degree-of-polymerization (DP) fructans and provided better control of Canada thistle and dandelion than did dicamba applied 11 d before the first frost. Dicamba and dicamba plus SAN 836H fall-applied were more effective in controlling Canada thistle and dandelion than was 2,4-D fall-applied. As the rate of dicamba and dicamba plus SAN 836H increased, the quantities of low-DP fructans in plant roots declined, and plant control increased. Activity of fructan 1-exohydrolase in roots of Canada thistle was increased by dicamba fall-applied and was closely associated with decline in the quantities of low-DP fructans.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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