From labels and weed guides
Best herbicides for witchgrass in soybeans
For witchgrass in soybeans, the weed guides list 24 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for soybeans.
Witchgrass 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 2 weed guides, 24 active-ingredient groups are rated at least 80% control for witchgrass in soybeans, showing the top 12 below.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| 78623 58% Technical Solution EPA 524-532; same active ingredients on 83 other branded products | glyphosate | 9 | Ks Weed Guide 2026, ks soybean post: E → 90–100% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean post trait glyphosate: E → 90–100% control (FieldMarshal policy interval) (PDF) |
| Arrow 2EC EPA 66222-60; same active ingredients on 36 other branded products | clethodim | 1 | Ks Weed Guide 2026, ks soybean post: G-E → 80–100% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean post: E → 90–100% control (FieldMarshal policy interval) (PDF) |
| Acumen EPA 241-337-55467; same active ingredients on 17 other branded products | pendimethalin | 3 | Ks Weed Guide 2026, ks soybean pre: G → 80–90% control (FieldMarshal policy interval) (PDF) |
| Aceto Trifluralin 4EC EPA 2749-561; same active ingredients on 13 other branded products | trifluralin | 3 | Mi Weed Guide 2026 Soybeans, mi soybean soil applied: E → 90–100% control (FieldMarshal policy interval) (PDF) |
| Boundary 6.5EC EPA 100-1162; same active ingredients on 13 other branded products | metolachlor and metribuzin | 5, 15 | Mi Weed Guide 2026 Soybeans, mi soybean soil premix: G → 80–90% control (FieldMarshal policy interval) (PDF) |
| Authority Elite EPA 279-3442; same active ingredients on 9 other branded products | metolachlor and sulfentrazone | 14, 15 | Ks Weed Guide 2026, ks soybean pre: G-E → 80–100% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean soil premix: G → 80–90% control (FieldMarshal policy interval) (PDF) |
| Caravel EPA 60063-58; same active ingredients on 7 other branded products | clomazone | 13 | Mi Weed Guide 2026 Soybeans, mi soybean soil applied: G → 80–90% control (FieldMarshal policy interval) (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) |
| ANNIHILATE EPA 279-3601-55467; same active ingredients on 3 other branded products | pyroxasulfone and sulfentrazone | 14, 15 | Ks Weed Guide 2026, ks soybean pre: G-E → 80–100% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean soil premix: E → 90–100% control (FieldMarshal policy interval) (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) |
| Enfilade DX EPA 91234-308; same active ingredients on 3 other branded products | fluazifop-p-butyl | 1 | Ks Weed Guide 2026, ks soybean post: G-E → 80–100% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean post: E → 90–100% control (FieldMarshal policy interval) (PDF) |
| Fever Prime EPA 89167-87-89391; same active ingredients on 2 other branded products | glufosinate and metolachlor | 10, 15 | Ks Weed Guide 2026, ks soybean post: G → 80–90% control (FieldMarshal policy interval) (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.