From labels and weed guides
Group 4 herbicides for lambsquarters in alfalfa
There are 2 Group 4 active-ingredient groups rated good or excellent for lambsquarters in alfalfa, with products labeled for alfalfa.
Group 4 mode of action (MOA) options
Group 4 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 alfalfa. 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, 2 active-ingredient groups are rated good or excellent for lambsquarters in alfalfa.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| 2,4-DB 175 EPA 19713-675-1381; same active ingredients on 8 other branded products | 2,4-db | 4 | ND Weed Guide 2026: G-E (PDF) |
| MCP Amine 4 EPA 34704-130; same active ingredients on 2 other branded products | mcpa | 4 | 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.