From labels and weed guides
Best herbicides for canada thistle in fallow
For canada thistle in fallow, the weed guides list 7 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for fallow.
Canada Thistle control in fallow
Every listed product is labeled for fallow. 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, 7 active-ingredient groups are rated at least 80% control for canada thistle in fallow.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Bite EPA 83529-74; same active ingredients on 9 other branded products | clopyralid | 4 | ND Weed Guide 2026: E → 90–99% control (PDF) |
| Enlist Duo EPA 62719-649; same active ingredients on 3 other branded products | 2,4-d and glyphosate | 4, 9 | ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Commando EPA 42750-92; same active ingredients on 1 other branded product | 2,4-d and clopyralid | 4 | ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Curtail M EPA 62719-86 | clopyralid and mcpa | 4 | ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Distinct EPA 7969-150 | dicamba and diflufenzopyr | 4, 19 | ND Weed Guide 2026: G → 80–90% control (PDF) |
| IMPACTZ EPA 5481-612 | atrazine and topramezone | 5, 27 | ND Weed Guide 2026: G → 80–90% control (PDF) |
| Truslate EPA 71368-86 | clopyralid and fluroxypyr 1-methylheptyl ester | 4 | ND Weed Guide 2026: G-E → 80–99% 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.