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.
QUIK STATS (last updated Dec 16, 2016 )
NOTES ABOUT THIS BIOTYPE
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.
CONTRIBUTING WEED SCIENTISTS