From labels and weed guides
Best herbicides for knotweed in sunflower
For knotweed in sunflower, the weed guides list 1 active-ingredient group rated good or excellent, after checking that the products are labeled for sunflower.
Knotweed control in sunflower
Every listed product is labeled for sunflower. 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, 1 active-ingredient group is rated good or excellent for knotweed in sunflower.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Sequence EPA 100-1185 | glyphosate and metolachlor | 9, 15 | WinField Crop Protection 2026, sunflower safflower: G (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.