From labels and weed guides
Best herbicides for quackgrass in field pea
For quackgrass in field pea, the weed guides list 4 active-ingredient groups rated good or excellent, after checking that the products are labeled for field pea.
Quackgrass control in field pea
Every listed product is labeled for field pea. 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, 4 active-ingredient groups are rated good or excellent for quackgrass in field pea.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Arrow 2EC EPA 66222-60; same active ingredients on 36 other branded products | clethodim | 1 | ND Weed Guide 2026: G-E (PDF); WinField Crop Protection 2026, pea: G (PDF) |
| Assure II EPA 352-541; same active ingredients on 3 other branded products | quizalofop-p-ethyl | 1 | ND Weed Guide 2026: G (PDF); ND Weed Guide 2026: E (PDF) |
| Kerb 50-W EPA 62719-397; same active ingredients on 2 other branded products | propyzamide | 23 | WinField Crop Protection 2026, pea: G (PDF) |
| Sequence EPA 100-1185 | glyphosate and metolachlor | 9, 15 | WinField Crop Protection 2026, pea: 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.
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Sources
Data from current labels and weed guides. Last source update: 2026-07-14.