From labels and weed guides
Best herbicides for purple ammannia (redstem) in rice
For purple ammannia (redstem) in rice, the weed guides list 2 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for rice.
Purple Ammannia (redstem) control in rice
Every listed product is labeled for rice. 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 purple ammannia (redstem) in rice.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Gambit EPA 81880-27-10163 | halosulfuron-methyl and prosulfuron | 2 | Ms Weed Guide 2025, ms rice pre: 7 → 80–90% control (FieldMarshal policy interval) (PDF) |
| League EPA 59639-166 | imazosulfuron | 2 | Ms Weed Guide 2025, ms rice pre: 7 → 80–90% control (FieldMarshal policy interval) (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.