From labels and weed guides
Group 3 herbicides for common barnyardgrass in cotton
There are 2 Group 3 active-ingredient groups rated good or excellent for common barnyardgrass in cotton, with products labeled for cotton.
Group 3 mode of action (MOA) options
Group 3 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 cotton. 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, 2 active-ingredient groups are rated good or excellent for common barnyardgrass in cotton.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Acumen EPA 241-337-55467; same active ingredients on 17 other branded products | pendimethalin | 3 | Ms Weed Guide 2025, ms cotton pre: E (PDF); ND Weed Guide 2026: E (PDF) |
| Aceto Trifluralin 4EC EPA 2749-561; same active ingredients on 13 other branded products | trifluralin | 3 | Ms Weed Guide 2025, ms cotton pre: E (PDF); ND Weed Guide 2026: 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
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: 2026-07-14.