From labels and weed guides
Best herbicides for perennial sowthistle in barley
For perennial sowthistle in barley, the weed guides list 2 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for barley.
Perennial Sowthistle control in barley
Every listed product is labeled for barley. 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, 2 active-ingredient groups are rated at least 80% control for perennial sowthistle in barley.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Commando EPA 42750-92; same active ingredients on 1 other branded product | 2,4-d and clopyralid | 4 | WinField Crop Protection 2026, small grains: G → 81–90% control (PDF) |
| Curtail M EPA 62719-86 | clopyralid and mcpa | 4 | WinField Crop Protection 2026, small grains: G → 81–90% 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.