From labels and weed guides
Best herbicides for canada thistle in corn silage
For canada thistle in corn silage, the weed guides list 8 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for corn silage.
Canada Thistle control in corn silage
Every listed product is labeled for corn silage. 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, 8 active-ingredient groups are rated at least 80% control for canada thistle in corn silage.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Definite EPA 83529-105; same active ingredients on 7 other branded products | acetochlor, clopyralid, and flumetsulam | 2, 4, 15 | ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Broadleaf Blend EPA 5481-678; same active ingredients on 4 other branded products | clopyralid and flumetsulam | 2, 4 | ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Orador EPA 91234-324; same active ingredients on 3 other branded products | acetochlor, clopyralid, and mesotrione | 4, 15, 27 | ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Distinct EPA 7969-150; same active ingredients on 2 other branded products | dicamba and diflufenzopyr | 4, 19 | ND Weed Guide 2026: G → 80–90% control (PDF) |
| GCS Clopy 360SL EPA 94730-20; same active ingredients on 2 other branded products | clopyralid | 4 | ND Weed Guide 2026: E → 90–99% control (PDF) |
| Commando EPA 42750-92 | 2,4-d and clopyralid | 4 | ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| DiFlexx DUO EPA 264-1184 | dicamba and tembotrione | 4, 27 | 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) |
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.