From labels and weed guides
Best herbicides for downy brome in grass seed
For downy brome in grass seed, the weed guides list 1 active-ingredient group rated good or excellent, after checking that the products are labeled for grass seed.
Downy Brome control in grass seed
Every listed product is labeled for grass seed. 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, 1 active-ingredient group is rated good or excellent for downy brome in grass seed.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Fierce EZ EPA 59639-237 | flumioxazin and pyroxasulfone | 14, 15 | 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.