Agronomy Guide 2007–2008

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.

Table 2.2-15. Weed sizes for postemergence corn herbicides. (Grasses)

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)	-	-	-	-	-	-

Table 2.2-15. (Grasses cont.)

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. For use on IMI or CL corn varieties only. Maximum height at application for yellow foxtail: Liberty-3-4″; Liberty ATZ-2″; Lightning-3″; Pursuit-3″. Yellow foxtail suppression only. For use on LibertyLink/GR corn hybrids only. For use on Roundup Ready corn hybrids only.

Table 2.2-15. Weed sizes for postemergence corn herbicides. (Broadleaves)

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

Table 2.2-15. (Broadleaves cont.)

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. No sizes given on label, sizes listed above are best estimates. For use on IMI or CL corn hybrids only. Resource and Tough labels refer to weed size by number of leaves (lvs). For use on glufosinate-resistant corn hybrids only. For use on Roundup Ready corn hybrids only.

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