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 with every rating at least 80% control, 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 has a lower interval bound of at least 80% control for the active-ingredient group. If a guide gives a range, its lower bound must be at least 80%.
Based on 1 weed guide, 1 active-ingredient group is rated at least 80% control 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 → 90–99% control (PDF) |
Rating bands: E 90-100%, G 80-89%, F 70-79%, P under 70%, N none. Policy intervals are marked in the source ratings. 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. Read the rating method.
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Sources
Data from current labels and weed guides. Last source update: 2026-09-30.