From labels and weed guides
Best herbicides for quackgrass in soybeans
For quackgrass in soybeans, the weed guides list 7 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for soybeans.
Quackgrass control in soybeans
Every listed product is labeled for soybeans. 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, 7 active-ingredient groups are rated at least 80% control for quackgrass in soybeans.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| Arrow 2EC EPA 66222-60; same active ingredients on 36 other branded products | clethodim | 1 | Mi Weed Guide 2026 Soybeans, mi soybean post: G → 80–90% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF); WinField Crop Protection 2026, soybean post: G → 81–90% control (PDF) |
| Basis Blend EPA 352-854; same active ingredients on 5 other branded products | rimsulfuron and thifensulfuron | 2 | ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Agent GT EPA 33270-30; same active ingredients on 3 other branded products | fomesafen and glyphosate | 9, 14 | Mi Weed Guide 2026 Soybeans, mi soybean post trait glyphosate: E → 90–100% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean burndown: G → 80–90% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: E → 90–99% control (PDF); WinField Crop Protection 2026, soybean post: G/E → 81–100% control (PDF) |
| Assure II EPA 352-541; same active ingredients on 3 other branded products | quizalofop-p-ethyl | 1 | Mi Weed Guide 2026 Soybeans, mi soybean post: E → 90–100% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: G → 80–90% control (PDF); ND Weed Guide 2026: E → 90–99% control (PDF); WinField Crop Protection 2026, soybean post: G/E → 81–100% control (PDF) |
| Enfilade DX EPA 91234-308; same active ingredients on 3 other branded products | fluazifop-p-butyl | 1 | Mi Weed Guide 2026 Soybeans, mi soybean post: G → 80–90% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: G → 80–90% control (PDF); WinField Crop Protection 2026, soybean post: G/E → 81–100% control (PDF) |
| Enlist Duo EPA 62719-649 | 2,4-d and glyphosate | 4, 9 | Mi Weed Guide 2026 Soybeans, mi soybean post trait enlist: E → 90–100% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean burndown p2 enlist: G → 80–90% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: E → 90–99% control (PDF) |
| Sequence EPA 100-1185 | glyphosate and metolachlor | 9, 15 | Mi Weed Guide 2026 Soybeans, mi soybean post trait glyphosate: E → 90–100% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean burndown: G → 80–90% control (FieldMarshal policy interval) (PDF); WinField Crop Protection 2026, soybean post: E → 91–100% 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.
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Sources
Data from current labels and weed guides. Last source update: 2026-09-30.