From labels and weed guides
Best herbicides for smartweed in potato
For smartweed in potato, the weed guides list 4 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for potato.
Smartweed control in potato
Every listed product is labeled for potato. 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, 4 active-ingredient groups are rated at least 80% control for smartweed in potato.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Actylis Metribuzin EPA 2749-660; same active ingredients on 30 other branded products | metribuzin | 5 | Mi Weed Guide 2026 Potato, mi potato pre: E → 90–100% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Potato, mi potato post: E → 90–100% control (FieldMarshal policy interval) (PDF); WinField Crop Protection 2026, potato: G → 81–90% control (PDF); WinField Crop Protection 2026, potato: E → 91–100% control (PDF) |
| Boundary 6.5EC EPA 100-1162; same active ingredients on 13 other branded products | metolachlor and metribuzin | 5, 15 | Mi Weed Guide 2026 Potato, mi potato pre: E → 90–100% control (FieldMarshal policy interval) (PDF); WinField Crop Protection 2026, potato: G → 81–90% control (PDF) |
| AIM EC EPA 279-3241; same active ingredients on 12 other branded products | carfentrazone-ethyl | 14 | WinField Crop Protection 2026, potato: G/E → 81–100% control (PDF) |
| Linex 4L EPA 61842-21; same active ingredients on 2 other branded products | linuron | 5 | WinField Crop Protection 2026, potato: G → 81–90% 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.