From labels and weed guides
Group 27 herbicides for waterhemp in field corn
There are 15 Group 27 active-ingredient groups rated good or excellent for waterhemp in field corn, with products labeled for field corn.
Group 27 mode of action (MOA) options
Group 27 is a herbicide mode of action (MOA) group. Treat it as one resistance-management check, not as the whole program.
Every listed product is labeled for field corn. 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 2 weed guides, 15 active-ingredient groups are rated good or excellent for waterhemp in field corn, showing the top 12 below.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| ARGOS EPA 74530-71; same active ingredients on 22 other branded products | mesotrione | 27 | Ia Weed Guide 2025, ia corn post: E (PDF); Ia Weed Guide 2025, ia corn pre: G-E (PDF); WinField Crop Protection 2026, corn post: E (PDF) |
| Double Header EPA 34704-1099; same active ingredients on 2 other branded products | acetochlor and mesotrione | 15, 27 | WinField Crop Protection 2026, corn post: E (PDF) |
| Equip EPA 83100-57-83979; same active ingredients on 2 other branded products | mesotrione and rimsulfuron | 2, 27 | WinField Crop Protection 2026, corn post: E (PDF) |
| Balance Flexx EPA 264-1067; same active ingredients on 1 other branded product | isoxaflutole | 27 | Ia Weed Guide 2025, ia corn pre: G-E (PDF) |
| Acuron EPA 100-1466 | atrazine, bicyclopyrone, mesotrione, and metolachlor | 5, 15, 27 | WinField Crop Protection 2026, corn post: E (PDF) |
| Acuron Flexi EPA 100-1568 | bicyclopyrone, mesotrione, and metolachlor | 15, 27 | WinField Crop Protection 2026, corn post: E (PDF) |
| Armezon PRO EPA 7969-372 | dimethenamid-p and topramezone | 15, 27 | WinField Crop Protection 2026, corn post: E (PDF) |
| Callisto Xtra EPA 100-1359 | atrazine and mesotrione | 5, 27 | WinField Crop Protection 2026, corn post: E (PDF) |
| Capreno EPA 264-1063 | tembotrione and thiencarbazone-methyl | 2, 27 | WinField Crop Protection 2026, corn post: E (PDF) |
| DiFlexx DUO EPA 264-1184 | dicamba and tembotrione | 4, 27 | WinField Crop Protection 2026, corn post: E (PDF) |
| Halex GT EPA 100-1282 | glyphosate, mesotrione, and metolachlor | 9, 15, 27 | WinField Crop Protection 2026, corn post: E (PDF) |
| Impact CORE EPA 5481-648 | acetochlor and topramezone | 15, 27 | WinField Crop Protection 2026, corn post: 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.
Build the full program
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Sources
Data from current labels and weed guides. Last source update: 2026-07-14.