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A Systems Approach for the Management of Russian Knapweed (Centaurea repens)

Published online by Cambridge University Press:  12 June 2017

Rick M. Bottoms  and
Tom D. Whitson
Rick M. Bottoms
Affiliation:
University of Missouri-Columbia, Oregon, MO 64473
Tom D. Whitson
Affiliation:
University of Wyoming, Laramie, WY 82070
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Abstract

Studies were initiated in Wyoming to determine the potential of grass competition as an alternative to repetitive herbicide treatment or other cultural practices for control of Russian knapweed. An experiment was established to evaluate the effects of five grass species, including Russian wildrye cv. ‘Bozoisky.’ Picloram, applied to Russian knapweed during the first frost, reduced Russian knapweed from an average of 80.1% live canopy cover which equates to 0% control. Untreated, unseeded checks resulted in 83.9 and 81.1% control in tilled and nontilled treated plots, respectively. Grass cover increased in untreated seeded plots from an average of 11.3 and 8.2% in tilled and nontilled plots, respectively, to 65% in tilled and 66% in nontilled plots treated with clopyralid plus 2,4-D. Grass cover also increased 69.7% in tilled and 66% in nontilled plots treated with picloram. There was no significant difference between grass varieties when compared to percent Russian knapweed cover. Reductions to zero live canopy cover of Russian knapweed were obtained with a single application of picloram. Economic feasibility thresholds were obtained from four out of five varieties, including a significant difference provided by nontilled Russian wildrye treated with picloram.

Keywords

Clopyralid, 3,6-dichloro-2-pyridinecarboxylic acid2,4-D (2,4-dichlorophenoxy) acetic acidpicloram, 4-amino-3,5,6-trichloro-2-pyridinecarboxylic acidRussian wildrye, Psathyrostachys juncea (Fisch.) Nevski ‘Bozoisky'Russian knapweedAcroptilon repens (L.) DC #3 CENRENoxious weedIPMculturalchemicalbiocontrolweed dynamics
Type
Symposium
Information
Weed Technology , Volume 12 , Issue 2 , June 1998 , pp. 363 - 366
Copyright
Copyright © 1998 by the Weed Science Society of America 

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References

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