Table 2.2-15. Weed sizes for postemergence corn herbicides.
- This table lists postemergence corn herbicides, their rates, and heights of weed species that are controlled or suppressed. This table is only a “quick reference”; refer to the herbicide label for additional information on application and timing.
| Grasses | Barnyard- grass |
Crabgrass | Fall panicum | Foxtail spp. | Johnsongrass (seedling) | Johnsongrass (rhizome) |
|---|---|---|---|---|---|---|
| Herbicide (rate/A) | --- height range (inches) at application --- | |||||
| Accent (0.66 oz) | 2-4 | - | 2-4 | 2-4 | 4-12 | 8-18 |
| Basis (0.33 oz) | 1-2 | - | 1-2 | 1-2 | - | - |
| Basis Gold (14 oz) | ≤3 | ≤1 | ≤3 | ≤3 | ≤8 | - |
| Beacon (0.76 oz) | - | - | ≤2 | 1-2 | 4-12 | 8-16* |
| Calisto (3 fl oz) | - | ≤2 | - | - | - | - |
| Celebrity Plus ( 4.7 oz) | 2-4 | - | 2-4 | 2-4 | 4-12 | 8-18 |
| Equip (1.5 oz) | ≤4 | ≤2* | ≤3 | ≤3 | ≤8 | ≤8 |
| Glyphosate (0.75 ae) | 4-6 | 4-6 | 4-6 | 4-6 | 4-6 | 4-6 |
| Impact (0.75 fl oz) | ≤4 | ≤3 | ≤3* | 3-43 | 4* | - |
| Liberty ATZ4 (40 fl oz) | * | ≤3 | ≤3 | ≤62 | ≤4 | * |
| Liberty4 (20 fl oz) | ≤2* | ≤2* | ≤2 | ≤63 | ≤2 | - |
| Liberty4 (28 fl oz) | ≤3 | ≤3 | ≤3 | ≤102 | ≤6 | - |
| Liberty4 (34 fl oz) | ≤4 | ≤4 | ≤4 | ≤112 | ≤8 | - |
| Lightning (1.28 oz) | 1-3 | 1-3 | 1-3 | 1-62 | 1-8 | 1-8* |
| Northstar (5 oz) | - | - | 1-3 | 1-3* | 4-12* | 8-16* |
| Option (1.5 oz) | ≤4 | ≤2* | ≤3 | ≤3 | ≤16 | ≤16 |
| Permit (1.0 oz) | - | - | - | - | - | - |
| Pursuit DG1 (1.44 oz) | 1-3 | 1-3 | - | 1-62 | 1-8 | 6-12 |
| Ready Master ATZ5 (2 qt) | ≤2 | ≤2 | ≤2 | 2-4 | 2-4 | 2-4 |
| Resolve (1 oz) | 1-2 | ≤0.5 | 1-2 | 1-2 | 1-2* | - |
| Roundup WeatherMax5 (22 fl oz) | 4-6 | 4-6 | 4-6 | 4-6 | 4-6 | 4-6 |
| Steadfast (0.75 oz) | ≤4 | ≤1* | ≤4 | ≤4 | ≤8 | ≤8* |
| Steadfast ATZ (14 oz) | ≤4 | ≤1* | ≤4 | ≤4 | 8-12 | 8-12 |
| Stout (0.75 oz) | ≤4 | - | ≤3 | ≤4 | ≤12 | ≤18 |
| Yukon (6-8 oz) | - | - | - | - | - | - |
| Grasses | Quackgrass | Shattercane | Wirestem muhly | Yellow nutsedge |
|---|---|---|---|---|
| Herbicide (rate/A) | --- height range (inches) at application --- | |||
| Accent (0.66 oz) | 4-10 | 4-12 | 8-12* | - |
| Basis (0.33 oz) | - | - | - | - |
| Basis Gold (14 oz) | ≤8* | ≤6 | - | ≤2* |
| Beacon (0.76 oz) | 4-8 | 4-12 | - | 1-4* |
| Calisto (3 fl oz) | - | - | - | - |
| Celebrity Plus ( 4.7 oz) | 4-10 | 4-12 | 8-12* | - |
| Equip (1.5 oz) | ≤4 | ≤8 | ≤6 | - |
| Glyphosate (0.75 ae) | 4-6 | 4-6 | 4-6 | 4-6 |
| Impact (0.75 fl oz) | - | - | - | - |
| Liberty ATZ4 (40 fl oz) | * | ≤4 | * | - |
| Liberty4 (20 fl oz) | - | * | - | - |
| Liberty4 (28 fl oz) | - | ≤6 | - | - |
| Liberty4 (34 fl oz) | * | ≤7 | * | - |
| Lightning (1.28 oz) | 1-3* | 1-8 | - | 1-3* |
| Northstar (5 oz) | 4-8* | 4-12 | - | 1-4* |
| Option (1.5 oz) | ≤10 | ≤12 | ≤10 | - |
| Permit (1.0 oz) | - | - | - | 4-12 |
| Pursuit DG1 (1.44 oz) | - | 1-8 | - | 1-3* |
| Ready Master ATZ5 (2 qt) | 2-4 | ≤2 | 2-4 | 2-4 |
| Resolve (1 oz) | 1-2* | 1-4 | - | 1-2* |
| Roundup WeatherMax5 (22 fl oz) | 4-6 | 4-6 | 4-6 | 4-6 |
| Steadfast (0.75 oz) | ≤8* | ≤6 | ≤8* | 2* |
| Steadfast ATZ (14 oz) | ≤8* | ≤6 | ≤4* | ≤2* |
| Stout (0.75 oz) | ≤10* | ≤12 | ≤8* | - |
| Yukon (6-8 oz) | - | - | - | 1-12 |
* Suppression only; additional control measures may be necessary.
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| Broadleaves | Burcu- cumber |
Cocklebur | Jimson- weed |
Lambsquarters | TR lambsquarters | Annual morning glory |
|---|---|---|---|---|---|---|
| Herbicide (rate/A) | --- height range (inches) at application --- | |||||
| 2,4-D1 | - | 6 | 3 | 4 | 4 | 6 |
| Accent (0.67 oz) | 3 | - | 3 | - | - | 2 |
| Aim (0.33 oz) | - | - | - | 4 | 4 | 2-3 lvs |
| Atrazine1 (2 qt) | 4 | 4 | 4 | 6 | - | 4 |
| Basagran (2 pt) | - | 10 | 10 | 2* | 2* | - |
| Basis (0.33 oz) | - | - | - | 3 | 3 | - |
| Basis Gold (14oz) | - | 3 | 4 | 3 | - | 3 |
| Beacon (0.38 oz) | - | 4 | 4 | - | - | - |
| Beacon (0.76 oz) | 4 | 4 | 4 | <1.5* | <1.5* | <1.5* |
| Beacon + 2,4-D or Clarity | 3 | 4 | 4 | 3 | 3 | - |
| Buctril (1.5-2 pt) | 4 | 10 | 6 | 8 | 8 | 4 |
| Buctril + atr. (2 pt) | 4 | 10 | 6 | 10 | 10 | 4 |
| Calisto (3 fl oz) | - | 5 | 5 | 5 | 5 | 5* |
| Celebrity Plus (4.7 oz) | 3 | 3 | 3 | 3 | 3 | 3 |
| Clarity/Banvel1 | 4 | 4 | 4 | 4 | 4 | 4 |
| Distinct1 | 4 | 4 | 4 | 4 | 4 | 4 |
| Equip (1.5 oz) | 4 | 4 | 4 | 4 | 4 | 2 |
| Exceed (1.0 oz) | 8 | 12 | 6 | 4 | 4 | 4* |
| Exceed + Clarity | 8 | 14 | 6 | 8 | 8 | 6 |
| Glyphosate (0.75 ae) | 6 | 6 | 6 | 6 | 6 | 6 |
| Harmony GT (0.083 oz) | - | - | - | 4 | 4 | - |
| Hornet (2.4 oz) | - | 6 | 6 | <2* | <2* | <2* |
| Impact (0.75 fl oz) | - | 8 | 6 | 6 | 6 | 6* |
| Laddok (1.67 pt) | - | 8 | 6 | 5 | 5 | 4 |
| Liberty ATZ4 (40 fl oz) | 6 | 12 | 8 | 4 | 4 | 6 |
| Liberty4 (20 fl oz) | 4 | 8 | 4 | 2 | 2 | 4 |
| Liberty4 (28 fl oz) | 8 | 12 | 8 | 4 | 4 | 6 |
| Liberty4 (34 fl oz) | 9 | 14 | 9 | 5 | 5 | 7 |
| Lightning² (1.28 oz) | - | 8 | 3 | 3 | 3 | 3 |
| Marksman¹ | 4 | 6 | 6 | 6 | 4 | 6 |
| Northstar (5 oz) | 4 | 6 | 6 | 4 | 4 | 3* |
| Option (1.5 oz) | 3 | 2 | 3 | 2 | 2 | 3* |
| Permit (0.67 oz) | 3* | 9 | - | 2* | 2* | - |
| Permit (1-1.33 oz) | 12* | 14 | - | 2* | 2* | 3* |
| Pursuit DG² (1.44 oz) | - | 8 | 3 | 2* | 2* | 2* |
| Ready Master ATZ5 (2 qt) | 4 | 4 | 4 | 4 | 4 | 4 |
| Resolve (1 oz) | - | 3* | - | 3* | 3* | 3* |
| Resource3 (6 oz) | - | - | - | 3 lvs | 3 lvs | - |
| Roundup WeatherMax5 (22 fl oz) | 6 | 6 | 6 | 6 | 6 | 6 |
| Spirit (1 oz) | 6 | 8 | 6 | 3 | 3 | 4* |
| Steadfast (0.75 oz) | - | - | 4 | 4* | 4* | 4 |
| Steadfast ATZ (14 oz) | 4 | 4 | 4 | 4 | - | 4 |
| Stout (0.75 oz) | 3 | - | 3 | 4 | 4 | 2-3 |
| Tough3 | 4 lvs | 4 lvs | 4 lvs | 4 lvs | 4 lvs | - |
| Yukon (4-8 oz) | 12* | 14 | 4 | 6 | 6 | 6 |
| Broadleaves | Eastern black nightshade | Pigweed | TR pigweed | Common ragweed | Giant ragweed | Smartweed | Velvet- leaf |
|---|---|---|---|---|---|---|---|
| Herbicide (rate/A) | --- height range (inches) at application --- | ||||||
| 2,4-D1 | 2 | 4 | 4 | 6 | 6 | - | 2 |
| Accent (0.67 oz) | - | 4 | 4 | - | - | 4 | - |
| Aim (0.33 oz) | 4 | 4 | 4 | - | - | - | 36 |
| Atrazine1 (2 qt) | 4 | 6 | - | 4 | 4 | 4 | 2 |
| Basagran (2 pt) | - | - | - | 3 | 6 | 10 | 5 |
| Basis (0.33 oz) | - | 3 | 3 | - | - | 3 | 3 |
| Basis Gold (14oz) | 2 | 4 | 4 | 3 | 3 | 4 | 3 |
| Beacon (0.38 oz) | 4 | 3 | 3 | 6 | 6 | 2 | - |
| Beacon (0.76 oz) | 4 | 4 | 4 | 9 | 9 | 4 | 4 |
| Beacon + 2,4-D or Clarity | 4 | 5 | 5 | 6 | 6 | 4 | 4 |
| Buctril (1.5-2 pt) | 6 | 2 | 2 | 6 | 6 | 6 | 5 |
| Buctril + atr. (2 pt) | 6 | 2-4 | - | 6 | 8 | 6 | 5 |
| Calisto (3 fl oz) | 5 | 5 | 5 | 5* | 5 | 5 | 5 |
| Celebrity Plus (4.7 oz) | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Clarity/Banvel1 | 4 | 4 | 4 | 4 | 4 | 6 | 2 |
| Distinct1 | 4 | 4 | 4 | 4 | 4 | 6 | 2 |
| Equip (1.5 oz) | 4 | 3-4 | 3-4 | 4 | 4 | 4 | 4 |
| Exceed (1.0 oz) | 4 | 5 | 5 | 12 | 10 | 6 | 6 |
| Exceed + Clarity | 4 | 8 | 8 | 12 | 10 | 8 | 8 |
| Glyphosate (0.75 ae) | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Harmony GT (0.083 oz) | - | 12 | 12 | - | - | 6 | 6 |
| Hornet (2.4 oz) | <2* | <2* | <2* | 6 | 6 | 6 | 6 |
| Impact (0.75 fl oz) | 6 | 6 | 6 | 6 | 8 | 3 | 8 |
| Laddok (1.67 pt) | 1 | 6 | 2 | 4 | 4 | 10 | 5 |
| Liberty ATZ4 (40 fl oz) | 6 | 4 | 4 | 12 | 10 | 12 | 5 |
| Liberty4 (20 fl oz) | 4 | 2* | 2* | 6 | 6 | 8 | 3 |
| Liberty4 (28 fl oz) | 6 | 4 | 4 | 12 | 10 | 12 | 5 |
| Liberty4 (34 fl oz) | 8 | 5 | 5 | 14 | 11 | 14 | 6 |
| Lightning² (1.28 oz) | 3 | 8 | 8 | 3* | 3 | 3 | 3 |
| Marksman¹ | 6 | 6 | 4 | 6 | 6 | 8 | 6 |
| Northstar (5 oz) | 6 | 5 | 5 | 9 | 9 | 4 | 4 |
| Option (1.5 oz) | 4 | 3 | 3 | 2 | 3* | - | 3 |
| Permit (0.67 oz) | - | 3 | 3 | 9 | 3 | 2 | 9 |
| Permit (1-1.33 oz) | - | 6 | 6 | 12 | 6 | 2 | 12 |
| Pursuit DG² (1.44 oz) | 3 | 8 | 8 | 3* | 3* | 3 | 3 |
| Ready Master ATZ5 (2 qt) | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Resolve (1 oz) | - | 3 | 3 | 3* | - | 3* | 3* |
| Resource3 (6 oz) | - | 3 lvs | 3 lvs | 3 lvs | - | - | 6 lvs |
| Roundup WeatherMax5 (22 fl oz) | 6 | 6 | 6 | 6 | 6 | 6 | 6 |
| Spirit (1 oz) | 5 | 4 | 4 | 9 | 9 | 6 | 6 |
| Steadfast (0.75 oz) | - | 4 | 4 | - | - | 4* | 4* |
| Steadfast ATZ (14 oz) | 4 | 4 | 4 | 4 | 4 | 4 | 2 |
| Stout (0.75 oz) | - | 4 | 4 | - | - | 4 | 4 |
| Tough3 | 4 lvs | 4 lvs | 4 lvs | - | - | - | - |
| Yukon (4-8 oz) | 6 | 12 | 12 | 12 | 6 | 3 | 12 |
* Suppression only, additional control measures may be necessary.
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