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 rated good or excellent, 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 stays at good or excellent for the active-ingredient group. If a guide gives a range, the weaker end of the range has to be good or excellent.
Based on 1 weed guide, 2 active-ingredient groups are rated good or excellent 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 (PDF) |
| Blanket EPA 81134-2-55467; same active ingredients on 2 other branded products | sulfentrazone | 14 | ND Weed Guide 2026: G-E (PDF) |
Rating legend: E=excellent, G=good, F=fair, P=poor, N=no control. 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.
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Sources
Data from current labels and weed guides. Last source update: 2026-07-14.