From labels and weed guides
Best herbicides for horseweed in field corn
For horseweed in field corn, the weed guides list 24 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for field corn.
Horseweed control in field corn
Every listed product is labeled for field corn. 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 3 weed guides, 24 active-ingredient groups are rated at least 80% control for horseweed in field corn, showing the top 12 below.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Bicep II Magnum EPA 100-817; same active ingredients on 15 other branded products | atrazine and metolachlor | 5, 15 | Mi Weed Guide 2026 Corn, mi corn soil premix: E → 90–100% control (FieldMarshal policy interval) (PDF) |
| Comply EPA 100-1414-55467; same active ingredients on 13 other branded products | atrazine, mesotrione, and metolachlor | 5, 15, 27 | Ms Weed Guide 2025, ms corn pre: 8 → 80–90% control (FieldMarshal policy interval) (PDF); Ms Weed Guide 2025, ms corn post: 8 → 80–90% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: E → 90–99% control (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Artemis EPA 83100-48-91395; same active ingredients on 8 other branded products | mesotrione and metolachlor | 15, 27 | Mi Weed Guide 2026 Corn, mi corn soil premix: G → 80–90% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Corn, mi corn soil premix p4: G → 80–90% control (FieldMarshal policy interval) (PDF) |
| Definite EPA 83529-105; same active ingredients on 7 other branded products | acetochlor, clopyralid, and flumetsulam | 2, 4, 15 | ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| COLT AS EPA 34704-1019; same active ingredients on 5 other branded products | clopyralid and fluroxypyr 1-methylheptyl ester | 4 | ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Enlist Duo EPA 62719-649; same active ingredients on 3 other branded products | 2,4-d and glyphosate | 4, 9 | Mi Weed Guide 2026 Corn, mi corn post trait enlist: G → 80–90% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: G-Ea → 80–99% control (PDF) |
| Orador EPA 91234-324; same active ingredients on 3 other branded products | acetochlor, clopyralid, and mesotrione | 4, 15, 27 | Mi Weed Guide 2026 Corn, mi corn soil premix p4: E → 90–100% control (FieldMarshal policy interval) (PDF); Ms Weed Guide 2025, ms corn pre: 9 → 90–100% control (FieldMarshal policy interval) (PDF); Ms Weed Guide 2025, ms corn post: 9 → 90–100% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Distinct EPA 7969-150; same active ingredients on 2 other branded products | dicamba and diflufenzopyr | 4, 19 | Mi Weed Guide 2026 Corn, mi corn post premix: E → 90–100% control (FieldMarshal policy interval) (PDF); Ms Weed Guide 2025, ms corn post: 8 → 80–90% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Double Header EPA 34704-1099; same active ingredients on 2 other branded products | acetochlor and mesotrione | 15, 27 | Mi Weed Guide 2026 Corn, mi corn soil premix: G → 80–90% control (FieldMarshal policy interval) (PDF) |
| Balance Flexx EPA 264-1067; same active ingredients on 1 other branded product | isoxaflutole | 27 | Mi Weed Guide 2026 Corn, mi corn soil applied: G/E → 80–100% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Acuron EPA 100-1466 | atrazine, bicyclopyrone, mesotrione, and metolachlor | 5, 15, 27 | Mi Weed Guide 2026 Corn, mi corn soil premix: E → 90–100% control (FieldMarshal policy interval) (PDF); Ms Weed Guide 2025, ms corn pre: 8 → 80–90% control (FieldMarshal policy interval) (PDF); Ms Weed Guide 2025, ms corn post: 8 → 80–90% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Acuron Flexi EPA 100-1568 | bicyclopyrone, mesotrione, and metolachlor | 15, 27 | Mi Weed Guide 2026 Corn, mi corn soil premix: G/E → 80–100% control (FieldMarshal policy interval) (PDF); 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.
Build the full program
Check crop, timing, state, resistance, and rotation in one plan before you make a recommendation.
Sources
Data from current labels and weed guides. Last source update: 2026-09-30.