From labels and weed guides
Best herbicides for canada thistle in canola
For canada thistle in canola, the weed guides list 1 active-ingredient group rated good or excellent, after checking that the products are labeled for canola.
Canada Thistle control in canola
Every listed product is labeled for canola. Ratings are shown when each weed guide that rates this weed stays at good or excellent for the active-ingredient group. If a guide gives a range, the weaker end of the range has to be good or excellent.
Based on 1 weed guide, 1 active-ingredient group is rated good or excellent for canada thistle in canola.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Bite EPA 83529-74; same active ingredients on 7 other branded products | clopyralid | 4 | ND Weed Guide 2026: E (PDF) |
Rating legend: E=excellent, G=good, F=fair, P=poor, N=no control. A range such as G-E means the guide gives a range; 'a' after a rating (e.g., Ga) means the guide assumes its recommended additive.
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Sources
Data from current labels and weed guides. Last source update: 2026-07-14.