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 rated good or excellent, 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 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, 2 active-ingredient groups are rated good or excellent 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 (PDF) |
| Curtail M EPA 62719-86 | clopyralid and mcpa | 4 | WinField Crop Protection 2026, small grains: G (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.