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 rated good or excellent, 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 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, 7 active-ingredient groups are rated good or excellent 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 (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 (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 (PDF) |
| Curtail M EPA 62719-86 | clopyralid and mcpa | 4 | ND Weed Guide 2026: G-E (PDF) |
| Distinct EPA 7969-150 | dicamba and diflufenzopyr | 4, 19 | ND Weed Guide 2026: G (PDF) |
| IMPACTZ EPA 5481-612 | atrazine and topramezone | 5, 27 | ND Weed Guide 2026: G (PDF) |
| Truslate EPA 71368-86 | clopyralid and fluroxypyr 1-methylheptyl ester | 4 | ND Weed Guide 2026: G-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.