From labels and weed guides
Best herbicides for waterhemp / palmer in cowpea
For waterhemp / palmer in cowpea, the weed guides list 2 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for cowpea.
Waterhemp / Palmer control in cowpea
Every listed product is labeled for cowpea. 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 waterhemp / palmer in cowpea.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| 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) |
| Bonedry EPA 82557-1; same active ingredients on 8 other branded products | paraquat | 22 | ND Weed Guide 2026: E → 90–99% 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.