From labels and weed guides
Best herbicides for lambsquarters in soybeans
For lambsquarters in soybeans, the weed guides list 33 active-ingredient groups with every rating at least 80% control, after checking that the products are labeled for soybeans.
Lambsquarters 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 5 weed guides, 33 active-ingredient groups are rated at least 80% control for lambsquarters in soybeans, showing the top 12 below.
| Example product | Active ingredients | MOA group | Ratings checked |
|---|---|---|---|
| 2,4-D Amine 4 EPA 1381-103; same active ingredients on 76 other branded products | 2,4-d | 4 | Ks Weed Guide 2026, ks soybean post: E → 90–100% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean post trait enlist: G → 80–90% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: E → 90–99% control (PDF) |
| Alligare Dicamba 4 EPA 81927-55; same active ingredients on 28 other branded products | dicamba | 4 | ND Weed Guide 2026: E → 90–99% control (PDF); ND Weed Guide 2026: G → 80–90% control (PDF) |
| Antares EPA 82534-5-5905; same active ingredients on 19 other branded products | sulfentrazone | 14 | Mi Weed Guide 2026 Soybeans, mi soybean soil applied: E → 90–100% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF); Sd Soybean Weed Guide 2026, sd soybean: 8 → 80–90% control (PDF) |
| Boundary 6.5EC EPA 100-1162; same active ingredients on 13 other branded products | metolachlor and metribuzin | 5, 15 | Ky Weed Guide 2025, ky soybean preemergence: 9 → 80–90% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean soil premix: G → 80–90% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: G → 80–90% control (PDF); Sd Soybean Weed Guide 2026, sd soybean: 7 → 80–90% control (PDF) |
| BLASTWAVE 240 EC EPA 103087-15; same active ingredients on 12 other branded products | oxyfluorfen | 14 | ND Weed Guide 2026: G → 80–90% control (PDF) |
| 2,4-DB 175 EPA 19713-675-1381; same active ingredients on 10 other branded products | 2,4-db | 4 | ND Weed Guide 2026: G-E → 80–99% control (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: E → 90–100% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean soil premix: E → 90–100% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: E → 90–99% control (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF) |
| Antares Prime EPA 82534-10-5905; same active ingredients on 8 other branded products | cloransulam-methyl and sulfentrazone | 2, 14 | ND Weed Guide 2026: E → 90–99% control (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF); Sd Soybean Weed Guide 2026, sd soybean: 8 → 80–90% control (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) |
| Aquesta MTZ EPA 91234-49; same active ingredients on 5 other branded products | metribuzin and sulfentrazone | 5, 14 | Mi Weed Guide 2026 Soybeans, mi soybean soil premix: E → 90–100% control (FieldMarshal policy interval) (PDF) |
| Authority Assist EPA 279-3330; same active ingredients on 5 other branded products | imazethapyr and sulfentrazone | 2, 14 | Ks Weed Guide 2026, ks soybean pre: E → 90–100% control (FieldMarshal policy interval) (PDF); Ky Weed Guide 2025, ky soybean preemergence: 9 → 80–90% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean soil premix: E → 90–100% control (FieldMarshal policy interval) (PDF); ND Weed Guide 2026: E → 90–99% control (PDF); ND Weed Guide 2026: G-E → 80–99% control (PDF); Sd Soybean Weed Guide 2026, sd soybean: 8 → 80–90% control (PDF) |
| Authority Maxx EPA 279-9560; same active ingredients on 5 other branded products | chlorimuron and sulfentrazone | 2, 14 | Ks Weed Guide 2026, ks soybean pre: E → 90–100% control (FieldMarshal policy interval) (PDF); Ky Weed Guide 2025, ky soybean preemergence: 9 → 80–90% control (FieldMarshal policy interval) (PDF); Mi Weed Guide 2026 Soybeans, mi soybean soil premix: E → 90–100% 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
- Ks Weed Guide 2026 (PDF)
- Ky Weed Guide 2025 (PDF)
- Mi Weed Guide 2026 Soybeans (PDF)
- ND Weed Guide 2026 (PDF)
- Sd Soybean Weed Guide 2026 (PDF)
Data from current labels and weed guides. Last source update: 2026-09-30.