Table 2.3-1. Weed control recommendations for grain sorghum, forage sorghum, sorghum x sudan hybrids
- See specific product label to determine correct rate for the soil type and weed species found in individual fields. See Table 2.2-8 to determine herbicide effectiveness on problem weeds.
- To reduce injury from Bicep, Bullet, Dual, Guardsman/Max, Intrro, Lariat, Lumax/Lexar, and Outlook treat sorghum seed with Concep or Screen. Pretreated seed sometimes is available.
- No-till sorghum is possible; if weeds have already emerged, add Gramoxone or glyphosate to the following preemergence treatments.
| Herbicide¹ | Crops | Application | Product/A | lb ai/A | Remarks |
|---|---|---|---|---|---|
| Atrazine 90DF | Grain,forage, or sorghum × sudan hybrids | Preplant or preemergence | 1.1–2.2 lb | 1–2 | Do not use on coarse-textured soils or soils with less than 1% organic matter. Atrazine is most commonly used in combination with other herbicides at 1.1 to 1.7 lb/A. On highly erodible ground with less than 30% surface residue, no more than 1.8 lb 90DF may be applied prior to crop emergence. See an atrazine label for additional restrictions. (Restricted-use pesticide and water quality advisory) |
| Dual II Magnum 7.64E/Cinch (s-metolachlor) | Grain,forage, or sorghum × sudan hybrids | Preplant or preemergence | 1.0–1.67 pt | 0.96–1.6 | Sorghum seed must be treated before planting with Concep or Screen to avoid severe Dual/Cinch injury. (Water quality advisory) |
Intrro 4ME (alachlor) |
Grain |
Preplant or preemergence |
1.5-3.0 oz |
1.5-3.0 |
Sorghum seed must be treated before planting with Screen or Concep to avoid severe alachlor injury. Early postemergence applications of Intrro on up to 5-inch-tall sorghum may be made to safened or unsafened seed. Use the higher rates in areas of yellow nutsedge and heavy weed infestation. (Restricted-use pesticide and water quality advisory) |
| Lorox 50DF | Grain or forage | Preemergence | 0.5–2.0 lb | 0.25–1.0 | Lorox can be tank mixed with other labeled herbicides for expanded weed control in sorghum. Sorghum seed must be planted at least 1 inch deep. Do not apply over top of emerged sorghum and within 75 days of harvest. |
| Outlook 6.0E (dimethenamid-P) | Grain | Preplant or preemergence | 10–21 fl oz | 0.47–0.98 | Sorghum seed must be properly treated with an approved chloroacetamide herbicide safener (Concep or Screen). Sorghum forage may be grazed or fed to livestock 60 or more days after application. Harvest grain or fodder 80 days or more after application. (Water quality advisory) |
| Sharpen 2.85SC (salflufenacil) |
Grain |
Preplant or preemergence |
1-2 fl ox |
0.022-0.044 |
Refer to Corn section for remarks about Sharpen. Sorghum forage can be harvested, fed, or grazed 70 days or more after application. |
| Herbicide¹ | Crops | Application | Product/A | lb ai/A | Remarks |
|---|---|---|---|---|---|
| Bicep II Magnum 5.5L/Cinch ATZ or Bicep Lite II Magnum 6L/Cinch ATZ lite (s-meto |
Grain, forage, or sorghum × sudan hybrids | Preplant or preemergence | 2.1–2.6 qt or 1.1–1.5 qt |
2.9–3.6 or 1.65–2.25 |
Sorghum seed must be treated before planting with Concep or Screen to avoid severe Bicep injury/Cinch ATZ injury. Do not use on soils with less than 1% organic matter. (Restricted-use pesticide and water quality advisory) |
| Bullet 4ME or Lariat 4L (alachlor + atrazine) | Grain | Preplant or preemergence | 2.4–4.0 qt | 2.5–4.0 | Sorghum seed must be treated before planting with Screen or Concep to avoid severe injury. Lariat may be applied early postemergence on up to 5-inch-tall sorghum that is safened or unsafened seed. (Restricted-use pesticide and water quality advisory) |
| Degree Xtra 4.04 ME (acetochlor + atrazine) | Grain | Preemergence to early postemergence | 2–3.7 qt | 2–3.7 | Sorghum seed must be treated with a protectant or safener. Degree Xtra can be applied preemergence up to before the crop exceeds 11 inches in height (5-6 leaves). Degree Xtra will not control emerged weeds. See label for additional use restrictions. |
| Guardsman Max 5L or G-Max Lite 5L (dimethenamid-P + atrazine) | Grain | Preplant or preemergence | 2.4–4.0 pt or 2.0–3.5 pt | 1.5–2.5 or 1.25–2.2 | Sorghum seed must be properly treated with an approved chloroacetamide herbicide safener (Concep or Screen). May be applied postemergence to grain soghum up to 12 inches tall. Sorghum forage may be grazed or fed to livestock 60 or more days after application. Harvest grain or fodder 80 days or more after application. (Restricted-use pesticide and water quality advisory) |
Lumax EZ 3.67 L (s-metolachlor + atrazine + mesotrione) |
Grain |
Preplant or preemergence |
2.7 qt |
2.48 |
Sorghum seed must be treated before planting with Concep to avoid severe crop injury. Applying less than 7 days before planting increases crop injury potential. Do not use on forage-type sorghum. Other mesotrione-containing herbicides such as Callisto, Lexar, and Zemax can be applied to grain sorghum. (Restricted-use pesticide and water quality advisory) |
| Herbicide¹ | Crops | Application | Product/A | lb ai/A | Remarks |
|---|---|---|---|---|---|
| 2,4-D amine 4S | Grain or forage | Postemergence | 0.75–1.25 pt | 0.36–0.6 | Apply to sorghum that is 6 to 15 inches tall prior to boot stage. Use drops if taller than 8 inches. Crop tolerance decreases as size increases. Do not harvest or graze for 7 days. See label for additional instructions. |
| Aim 2EW (carfentrazone) |
Grain or forage | Postemergence | 0.5–1.0 fl oz | 0.008–0.016 | Sorghum seed must be treated before planting with Concep to avoid severe crop injury. Applying less than 7 days before planting increases crop injury potential. Do not use on forage-type sorghum. Other mesotrione-containing herbicides such as Callisto, Lexar, and Zemax can be applied to grain sorghum. (Restricted-use pesticide and water quality advisory) |
| Atrazine 90DF | Grain, forage, or sorghum × sudan hybrids | Postemergence | 1.3–2.2 lb | 1.2–2.0 | Apply 1.3 lb with 1 qt crop oil concentrate for broadleaves only. Apply to sorghum after the 3-leaf stage, but before 12 inches in height. Higher rate may provide some grass control (not effective on fall panicum or crabgrass). Do not use on coarse-textured soils. Do not graze or feed for 45 days. If atrazine was used previously that same season, do not exceed a total of 2.5 lb ai/A per calendar year (2.5 qt). See label for additional restrictions. (Restricted-use pesticide and water quality advisory) |
Basagran 4S (bentazon) |
Grain, forage, or sorghum x sudan hybrids |
Postemergence |
1.5-2 pt |
0.75-1.0 |
Apply when weeds are small and actively growing. Spilt treatments may be required for yellow nutsedge and Canada thistle control. Tank-mix to broaden weed control spectrum. Include the necessary adjuvant in the spray mixture. Do not apply to sorghum that is heading or blooming. Do not graze for at least 12 days after last treatment. |
| Buctril 2E (bromoxynil) or Buctril + Atrazine 3L (bromoxynil +atrazine) | Grain, forage, or sorghum × sudan hybrids | Postemergence | 1.0–1.5 pt or 1.5–3.0 pt | 0.25–0.375 or 0.56–1.12 | Apply 1 pt from emergence to preboot or 1.5 pt from 4 leaf to pre- boot (12 inches for Buctril + atrazine) when weeds are in the 2- to 4-leaf stage. Do not graze or feed for 45 days. Consider previous atrazine applications and do not exceed 2.5 lb (qt)/A/year. (Buctril + atrazine is a restricted-use pesticide and carries a water quality advisory.) |
| Clarity 4S/Banvel 4S (dicamba) or Marksman 3.2L (dicamba + atrazine) | Grain, forage, or sorghum × sudan hybrids | Postemergence | 0.5 pt or1.5–2.0 pt | 0.25 or 0.6–0.8 | Apply to sorghum after the 3-leaf stage and before 15 inches tall (12 inches for Marksman). Use drop nozzles after sorghum is beyond 8 inches tall. Do not use oil or surfactant. Do not graze or feed treated forage to animals before 21 days after application or wait at least 37 days to harvest for hay. Consider previous atrazine applications and do not exceed 2.5 lb (qt)/A/year. (Marksman is a restricted-use pesticide and carries a water quality advisory.) |
Husky 2.06L (pyrasulfotole + bromoxynil) |
Grain, forage, or sorghum x sudan hybrids |
Postemergence |
12.8-16 fl oz |
0.206-0.258 |
Apply when sorghum is between the 3-leaf stage and 12 inches tall to control certain broadleaf weeds. Apply when weeds are <4 inches tall and include AMS if necessary. Tank-mix to broaden weed control spectrum. Do not apply more than 32 fl oz/A/season. Unacceptable crop injury may occur if mesotrione-containing herbicides (Callisto, Lumax, Lexar, Zemax) were previously applied. Do not graze or harvest for forage within 7 days or within 60 days for grain or stover after application. |
| Paramount 75DF | Grain | Preemergence to postemergence | 5.3–8.0 | 0.25–0.375 | Apply Paramount to grain sorghum at 5.3–8 oz/A from pre to 12-inch tall sorghum for control of certain annual grasses and suppression of common broadleaves. To enhance activity, tank mix with atrazine or other labeled herbicide for sorghum. Do not allow grazing of treated area. Do not harvest hay from treated area for at least 10.5 month after application. See label for additional restrictions. |
| Peak 57WG (prosulfuron) | Grain | Postemergence | 0.5–1.0 oz | 0.018–0.036 | Peak controls many annual broadleaves and suppresses some perennial broadleaves. Apply to sorghum between 5 and 30 inches in height when broadleaf weeds are small (1–4 inches) and actively growing. The 0.75 oz/A is the standard rate. Include a nonionic surfactant or crop oil concentrate in the spray solution. Peak may be tank-mixed with Banvel, Clarity, 2,4-D, atrazine, Buctril, Buctril + atrazine, or Marksman. Do not plant normal field corn for 1 month, soybeans or tobacco for 10 months, or alfalfa or clover for 22 months. Wheat, barley, oats, and rye have no rotation restriction; see label for additional cropping and other restrictions. |
| Permit 75DF or Sandea 75DF (halosulfuron) | Grain | Postemergence | 0.67 oz | 0.032 lb | Apply Permit to milo from the 2-leaf stage through layby (before grain head emergence). Temporary stunting may occur following application if crop is under stress; crop will recover under normal growing conditions. Do not graze or harvest for forage for 30 days following application. See Table 2.2-19 for recrop information. |
| Roundup 3S/ Roundup Weather Max 4.5S²/glyphosate |
Grain (grain <30% moisture) | Preharvest aid | 1–2 pt | 0.5–1.0 | Apply to grain after it has <30% moisture content and at least 7 days before harvest. Do not apply to sorghum grown for seed. See Table 2.2-1a for more glyphosate options and information. |
| Shotgun 3.25L (2,4-D + atrazine) | Grain, forage, or sorghum × sudan hybrids | Postemergence | 2 pt | 0.81 | Shotgun is a mixture of atrazine + 2,4-D. Apply 2 pint per acre broadcast (0.56 lb atrazine + 0.25 lb 2,4-D) from spike to 4-leaf stage (8 inches tall). See atrazine restrictions at end of Table 2.2-7. Do not graze or feed forage from treated area for 21 days following application. See Table 2.2-17 for recrop information. (Restricted-use pesticide and water quality advisory) |
| Weedmaster 3.87S (dicamba + 2,4-D) | Grain, forage, or sorghum × sudan hybrids | Postemergence | 1 pt | 0.48 | Apply 1 pt/A to sorghum in the 3–5 leaf stage (4–8 inches tall). For best results, apply when weeds are less than 3 inches tall. Do not use adjuvants or crop injury may result. Grazing/silage restrictions: 0 days for nonlactating animals; 7 days for lactating animals; do not harvest for silage or hay within 37 days after treatment; do not graze meat animals within 30 days of slaughter. |
| Yukon 67.5WDG (halsulfuron + dicamba) | Grain | Postemergence | 4–6 oz | 0.17–0.25 | Apply Yukon to grain sorghum from the 2-leaf through 15-inch tall stage. Temporary stunting may occur following application if crop is under stress; crop will recover under normal growing conditions. Do not graze or feed treated sorghum forage or silage prior to mature grain stage. See Table 2.2-19 for recrop information. |
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