From labels and weed guides
Best herbicides for annual smartweed in spinach
For annual smartweed in spinach, the weed guides list 2 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for spinach.
Annual Smartweed control in spinach
Every listed product is labeled for spinach. 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 annual smartweed in spinach.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Bite EPA 83529-74; same active ingredients on 7 other branded products | clopyralid | 4 | ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Blanket EPA 81134-2-55467; same active ingredients on 2 other branded products | sulfentrazone | 14 | ND Weed Guide 2026: G-E → 80–99% 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.