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Does a Diflufenzopyr Plus Dicamba Premix Synergize Russian Knapweed (Acroptilon repens) Control with Auxinic Herbicides?

Published online by Cambridge University Press:  20 January 2017

Stephen F. Enloe  and
Andrew R. Kniss
Stephen F. Enloe*
Affiliation:
Department of Agronomy and Soils, Auburn University, AL 36849
Andrew R. Kniss
Affiliation:
Department of Plant Sciences, University of Wyoming, Laramie, WY 82071
*
Corresponding author's E-mail: sfe0001@auburn.edu
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Abstract

Diflufenzopyr is a synergist that improves broadleaf weed control when mixed with certain auxinic herbicides. In nonagricultural settings, it is only available in a premix with dicamba, which is labeled for noncrop sites, pasture, hay, and rangeland. Our objectives were to determine the influence of diflufenzopyr + dicamba when applied with auxinic herbicides for Russian knapweed control. Studies were conducted near Ethete, WY, from 2005 to 2008 in a pasture heavily infested with Russian knapweed. Treatments were applied in the fall (September) and included aminopyralid, clopyralid, clopyralid + 2,4-D, clopyralid + triclopyr, and picloram at standard and reduced rates, with and without diflufenzopyr + dicamba. At 12 and at 24 mo after treatment (MAT), diflufenzopyr + dicamba did not influence Russian knapweed control when applied with standard rates of aminopyralid, clopyralid, clopyralid + 2,4-D, clopyralid + triclopyr, or picloram. All of these treatments except clopyralid + 2,4-D consistently provided ≥ 80% control 24 MAT. Reduced-rate herbicide interactions with diflufenzopyr + dicamba were also not significant at 12 MAT. However, at 24 MAT, aminopyralid applied with diflufenzopyr + dicamba controlled Russian knapweed 83% compared with 59% when aminopyralid was applied alone. Russian knapweed control with all other reduced-rate treatments, except picloram, fell below 80%. These results indicate that diflufenzopyr + dicamba does not generally improve Russian knapweed control at 12 or 24 MAT with either standard or reduced rates of typical fall, auxinic herbicide treatments.

Keywords

2,4-D amineaminopyralidclopyraliddicambadiflufenzopyrpicloramtriclopyrRussian knapweed, Acroptilon repens (L.) DC. ACRREAuxin synergistinvasive forbcreeping perennialpasturewildland
Type
Research
Information
Invasive Plant Science and Management , Volume 2 , Issue 4 , October 2009 , pp. 318 - 323
Copyright
Copyright © Weed Science Society of America 

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