From labels and weed guides
Best herbicides for annual smartweed in soybeans
For annual smartweed in soybeans, the weed guides list 36 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for soybeans.
Annual Smartweed 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 2 weed guides, 36 active-ingredient groups are rated at least 80% control for annual smartweed in soybeans, showing the top 12 below.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Alligare Dicamba 4 EPA 81927-55; same active ingredients on 28 other branded products | dicamba | 4 | ND Weed Guide 2026: E → 90–99% control (PDF) |
| Agent 1.88 EPA 33270-31; same active ingredients on 16 other branded products | fomesafen | 14 | ND Weed Guide 2026: E → 90–99% control (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF); ND Weed Guide 2026: G → 80–90% control (PDF); WinField Crop Protection 2026, soybean post: G/E → 81–100% control (PDF); WinField Crop Protection 2026, soybean post: G → 81–90% control (PDF) |
| Bonedry EPA 82557-1; same active ingredients on 13 other branded products | paraquat | 22 | ND Weed Guide 2026: E → 90–99% control (PDF) |
| Boundary 6.5EC EPA 100-1162; same active ingredients on 13 other branded products | metolachlor and metribuzin | 5, 15 | ND Weed Guide 2026: G → 80–90% control (PDF); WinField Crop Protection 2026, soybean pp pre: G → 81–90% control (PDF) |
| FIRSTSHOT SG EPA 279-9609; same active ingredients on 11 other branded products | thifensulfuron and tribenuron-methyl | 2 | WinField Crop Protection 2026, soybean burndown: E → 91–100% control (PDF) |
| Axill Solutions Imazethapyr 2SL EPA 93809-3; same active ingredients on 10 other branded products | imazethapyr | 2 | ND Weed Guide 2026: G → 80–90% control (PDF); WinField Crop Protection 2026, soybean burndown, Q17 rating table, pp. 13, 14, 16, 106, 107, 108, 459, 460: G → 81–90% control (PDF); WinField Crop Protection 2026, soybean post, U04 rating table, pp. 16, 108, 190, 246, 264, 304, 347, 374, 390, 407, 426, 474, 518, 568: G → 81–90% control (PDF) |
| Acifin 2L EPA 82534-2-88783; same active ingredients on 9 other branded products | acifluorfen | 14 | ND Weed Guide 2026: E → 90–99% control (PDF); WinField Crop Protection 2026, soybean post: G/E → 81–100% control (PDF) |
| Authority Elite EPA 279-3442; same active ingredients on 9 other branded products | metolachlor and sulfentrazone | 14, 15 | ND Weed Guide 2026: G-E → 80–99% control (PDF); WinField Crop Protection 2026, soybean pp pre: G → 81–90% control (PDF) |
| Abigor EPA 34704-1174; same active ingredients on 8 other branded products | imazamox | 2 | ND Weed Guide 2026: G-E → 80–99% control (PDF); WinField Crop Protection 2026, soybean post: G → 81–90% control (PDF) |
| Antares Prime EPA 82534-10-5905; same active ingredients on 8 other branded products | cloransulam-methyl and sulfentrazone | 2, 14 | ND Weed Guide 2026: E → 90–99% control (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF); WinField Crop Protection 2026, soybean pp pre: G/E → 81–100% control (PDF) |
| Basagran EPA 66330-413; same active ingredients on 8 other branded products | bentazon | 6 | ND Weed Guide 2026: E → 90–99% control (PDF); WinField Crop Protection 2026, soybean post: E → 91–100% control (PDF) |
| Ankur EPA 83529-98; same active ingredients on 7 other branded products | cloransulam-methyl | 2 | ND Weed Guide 2026: E → 90–99% control (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF); WinField Crop Protection 2026, soybean pp pre: G → 81–90% control (PDF); WinField Crop Protection 2026, soybean post: G/E → 81–100% 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.