INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Spotted knapweed (Centaurea stoebe ssp. micranthos) is a dicot weed in the Asteraceae family. In British Columbia this weed first evolved resistance to Group 4 (Legacy O) herbicides in 2013 and infests Rangeland. Group 4 (Legacy O) herbicides are known as Auxin Mimics
(Auxin Mimics
). Research has shown that these particular biotypes are resistant to clopyralid, and picloram and they may be cross-resistant to other Group 4 (Legacy O) herbicides. The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.
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| Common Name | Spotted knapweed | | Species | Centaurea stoebe ssp. micranthos | | Group | Auxin Mimics
HRAC Group 4 (Legacy O)
| | Herbicides | clopyralid, and picloram | | Location | Canada, British Columbia | | Year | 2013 | | Situation(s) | Rangeland | | Contributors - (Alphabetically) | Linda Hall, and Amy Mangin | |
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| | Amy Mangin | Can. J. Plant Sci. 00: 1–4 (0000) dx.doi.org/10.1139/cjps-2016-0008
First report: spotted knapweed (Centaurea stoebe) resistance to auxinic herbicides
Amy R. Mangin and Linda M. Hall
Abstract: Spotted knapweed is a prohibited noxious weed that is primarily controlled with auxinic herbicides. A population collected from a managed rangeland in East Kootenay, BC, was highly resistant to both clopyralid and picloram, with R/S ratios of >25 600 and 28, respectively. This is the first report of resistance in spotted knapweed. Edit this Note | Add New Note |
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| | Greenhouse trials comparing a known susceptible Spotted knapweed biotype with this Spotted knapweed biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information. |
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| | Genetic studies on HRAC Group 4 resistant Spotted knapweed have not been reported to the site. There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature |
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| | The mechanism of resistance for this biotype is either unknown or has not been entered in the database. If you know anything about the mechanism of resistance for this biotype then please update the database. |
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| | There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes. If you have any information pertaining to the fitness of Group 4 (Legacy O) resistant Spotted knapweed from British Columbia please update the database. |
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| Alberta Agriculture
Plant Industry Division
Agronomy Unit
4550 New Linden Hill Rd
Ste 501,
Edmonton, T6H 5Z2, Alberta
Canada
Email Linda Hall |
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| Graduate Student
University of Alberta
Agricultural
Food and Nutritional Sciences
410 Agriculture/Forestry Centre
Edmonton, T6G 2E1, Alberta
Canada
Email Amy Mangin |
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| Drag a column header and drop it here to group by that column |
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1
| Canada (British Columbia) | Canada | British Columbia | 2013 |
Rangeland
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clopyralid, and picloram
| 7 |
Auxin Mimics
( HRAC Group 4 (Legacy O)
| 334 | Centaurea stoebe ssp. micranthos | Spotted knapweed | 15061 |
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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I. The International Herbicide-Resistant Weed Database. Online.
. Available
www.weedscience.org
Copyright © 1993-
WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.
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