From labels and weed guides
Best herbicides for witchgrass in potato
For witchgrass in potato, the weed guides list 7 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for potato.
Witchgrass 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 1 weed guide, 7 active-ingredient groups are rated at least 80% control for witchgrass in potato.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Arrow 2EC EPA 66222-60; same active ingredients on 36 other branded products | clethodim | 1 | Mi Weed Guide 2026 Potato, mi potato post: E → 90–100% control (FieldMarshal policy interval) (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: G → 80–90% control (FieldMarshal policy interval) (PDF) |
| Epitome EPA 2749-636; same active ingredients on 3 other branded products | eptc | 15 | Mi Weed Guide 2026 Potato, mi potato ppi: E → 90–100% control (FieldMarshal policy interval) (PDF) |
| Outlook EPA 7969-156; same active ingredients on 1 other branded product | dimethenamid-p | 15 | Mi Weed Guide 2026 Potato, mi potato pre: G → 80–90% control (FieldMarshal policy interval) (PDF) |
| Sequence EPA 100-1185 | glyphosate and metolachlor | 9, 15 | Mi Weed Guide 2026 Potato, mi potato pre: G → 80–90% control (FieldMarshal policy interval) (PDF) |
| Sonalan HFP EPA 10163-356 | ethalfluralin | 3 | Mi Weed Guide 2026 Potato, mi potato ppi: E → 90–100% control (FieldMarshal policy interval) (PDF) |
| Zidua SC EPA 7969-374 | pyroxasulfone | 15 | Mi Weed Guide 2026 Potato, mi potato pre: E → 90–100% 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.
Build the full program
Check crop, timing, state, resistance, and rotation in one plan before you make a recommendation.
Sources
Data from current labels and weed guides. Last source update: 2026-09-30.