From labels and weed guides
Best herbicides for giant (horseweed) ragweed in soybeans
For giant (horseweed) ragweed in soybeans, the weed guides list 7 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for soybeans.
Giant (horseweed) Ragweed control in soybeans
Every listed product is labeled for soybeans. 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, 7 active-ingredient groups are rated at least 80% control for giant (horseweed) ragweed in soybeans.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Agent 1.88 EPA 33270-31; same active ingredients on 16 other branded products | fomesafen | 14 | Ky Weed Guide 2025, ky soybean postemergence: 8 → 80–90% control (FieldMarshal policy interval) (PDF) |
| Axill Solutions Imazethapyr 2SL EPA 93809-3; same active ingredients on 10 other branded products | imazethapyr | 2 | Ky Weed Guide 2025, ky soybean postemergence: 8 → 80–90% control (FieldMarshal policy interval) (PDF) |
| Acifin 2L EPA 82534-2-88783; same active ingredients on 9 other branded products | acifluorfen | 14 | Ky Weed Guide 2025, ky soybean postemergence: 8 → 80–90% control (FieldMarshal policy interval) (PDF) |
| Abigor EPA 34704-1174; same active ingredients on 8 other branded products | imazamox | 2 | Ky Weed Guide 2025, ky soybean postemergence: 8 → 80–90% control (FieldMarshal policy interval) (PDF) |
| Ankur EPA 83529-98; same active ingredients on 7 other branded products | cloransulam-methyl | 2 | Ky Weed Guide 2025, ky soybean postemergence: 9 → 80–90% control (FieldMarshal policy interval) (PDF) |
| Authority Maxx EPA 279-9560; same active ingredients on 5 other branded products | chlorimuron and sulfentrazone | 2, 14 | Ky Weed Guide 2025, ky soybean preemergence: 8 → 80–90% control (FieldMarshal policy interval) (PDF) |
| Tendovo EPA 100-1684 | cloransulam-methyl, metolachlor, and metribuzin | 2, 5, 15 | Ky Weed Guide 2025, ky soybean preemergence: 8 → 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.