From labels and weed guides
Best herbicides for marestail/horseweed in fallow
For marestail/horseweed in fallow, the weed guides list 3 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for fallow.
Marestail/horseweed control in fallow
Every listed product is labeled for fallow. 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, 3 active-ingredient groups are rated at least 80% control for marestail/horseweed in fallow.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Alligare Dicamba 4 EPA 81927-55; same active ingredients on 36 other branded products | dicamba | 4 | Ks Weed Guide 2026, ks wheat fallow pre: E → 90–100% control (FieldMarshal policy interval) (PDF) |
| Axill Solutions Flumi 51% WDG EPA 95055-14-93809; same active ingredients on 27 other branded products | flumioxazin | 14 | Ks Weed Guide 2026, ks wheat fallow pre: G → 80–90% control (FieldMarshal policy interval) (PDF) |
| Picture EPA 83529-126; same active ingredients on 2 other branded products | picloram | 4 | Ks Weed Guide 2026, ks wheat fallow pre: G → 80–90% 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.
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Sources
Data from current labels and weed guides. Last source update: 2026-09-30.