Agronomy Guide 2009–2010

Section 2 Table of Contents

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	Crab- grass	Fall panicum	Foxtail spp.	Johnson- grass (seedling)	Johnson- grass (rhizome)	Quack- grass	Shatter- cane	Wirestem muhly	Yellow nutsedge
Herbicide (rate/A)	--- height range (inches) at application ---
* Suppression only; additional control measures may be necessary. For use on IMI or CL corn varieties only. Maximum height at application for yellow foxtail: Ignite = 3–4 inches; Lightning = 3 inches; Pursuit = 3 inches. Yellow foxtail suppression only. For use on LibertyLink/GR corn hybrids only. For use on Roundup Ready corn hybrids only.
Accent (0.66 oz)	2–4	—	2–4	2–4	4–12	8–18	4–10	4–12	8–12*	—
Basis (0.33 oz)	1–2	—	1–2	1–2	—	—	—	—	—	—
Beacon (0.76 oz)	—	—	≤2	1–2	4–12	8–16*	4–8	4–12	—	1–4*
Callisto (3 fl oz)	—	≤2	—	—	—	—	—	—	—	—
Celebrity Plus (4.7 oz)	2–4	—	2–4	2–4	4–12	8–18	4–10	4–12	8–12*	—
Equip (1.5 oz)	≤4	≤2*	≤3	≤3	≤8	≤8	≤4	≤8	≤6	—
Glyphosate (0.75 ae)	4–6	4–6	4–6	4–6	4–6	4–6	4–6	4–6	4–6	4–6
Halex GT (3.6 pt)	≤4	≤4	≤4	≤4	≤4	≤4	≤4	≤4	≤4	≤4
Ignite4 (22 fl oz)	≤3	≤3	≤3	≤6²	≤3	—	—	≤6	—	*
Ignite4 (29 fl oz)	≤5	≤5	≤5	≤12	≤5	—	*	≤8	*	*
Impact (0.75 fl oz)	≤4	≤3	≤3*	3–4³	≤4	—	—	—	—	—
Laudis (3 fl oz)	1–5	1–3	—	1–3	1–5	—	—	1–6	—	—
Liberty4 (20 fl oz)	≤2*	≤2*	≤2	≤6³	≤2	—	—	*	—	—
Lightning (1.28 oz)	1–3	1–3	1–3	1–6²	1–8	1–8*	1–3*	1–8	—	1–3*
NorthStar (5 oz)	—	—	1–3	1–3*	4–12*	8–16*	4–8*	4–12	—	1–4*
Option (1.5 oz)	≤4	≤2*	≤3	≤3	≤16	≤16	≤10	≤12	≤10	—
Permit (1.0 oz)	—	—	—	—	—	—	—	—	—	4–12
Ready Master ATZ5 (2 qt)	≤2	≤2	≤2	2–4	2–4	2–4	2–4	≤2	2–4	2–4
Require Q (4 oz)	1–2	0.5	1–2	1–2	*	—	*	1–4	—	*
Resolve (1 oz)	1–2	≤0.5	1–2	1–2	1–2*	—	1–2*	1–4	—	1–2*
Resolve Q (1.25 oz)	1–2	0.5	1–2	1–2	*	—	*	1–4	—	*
Roundup WeatherMax5 (22 fl oz)	4–6	4–6	4–6	4–6	4–6	4–6	4–6	4–6	4–6	4–6
Steadfast (0.75 oz)	≤4	≤1*	≤4	≤4	≤8	≤8*	≤8*	≤6	≤8*	2*
Steadfast ATZ (14 oz)	≤4	≤1*	≤4	≤4	8–12	8–12	≤8*	≤6	≤4*	≤2*
Stout (0.75 oz)	≤4	—	≤3	≤4	≤12	≤18	≤10*	≤12	≤8*	—
Yukon (6–8 oz)	—	—	—	—	—	—	—	—	—	1–12

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

Broadleaves	Burcu- cumber	Cockle- bur	Jimson- weed	Lambs- quarters	TR lambs- quarters	Annual morning glory	E. black night- shade	Pig- weed	TR pig- weed	Com. rag- weed	Giant rag- weed	Smart- weed	Velvet- leaf
Herbicide (rate/A)	--- height range (inches) at application ---
2,4-D¹	—	6	3	4	4	6	2	4	4	6	6	—	2
Accent (0.67 oz)	3	—	3	—	—	2	—	4	4	—	—	4	—
Aim (0.33 oz)	—	—	—	4	4	2–3 lvs	4	4	4	—	—	—	36
Atrazine¹ (2 qt)	4	4	4	6	—	4	4	6	—	4	4	4	2
Basagran (2 pt)	—	10	10	2*	2*	—	—	—	—	3	6	10	5
Basis (0.33 oz)	—	—	—	3	3	—	—	3	3	—	—	3	3
Beacon (0.38 oz)	—	4	4	—	—	—	4	3	3	6	6	2	—
Beacon (0.76 oz)	4	4	4	<1.5*	<1.5*	<1.5*	4	4	4	9	9	4	4
Beacon + 2,4-D or Clarity	3	4	4	3	3	—	4	5	5	6	6	4	4
Buctril (1.5–2 pt)	4	10	6	8	8	4	6	2	2	6	6	6	5
Buctril + atr. (2 pt)	4	10	6	10	10	4	6	2–4	—	6	8	6	5
Callisto (3 fl oz)	—	5	5	5	5	5*	5	5	5	5*	5	5	5
Celebrity Plus (4.7 oz)	3	3	3	3	3	3	3	3	3	3	3	3	3
Clarity/Banvel¹	4	4	4	4	4	4	4	4	4	4	4	6	2
Distinct¹	4	4	4	4	4	4	4	4	4	4	4	6	2
Equip (1.5 oz)	4	4	4	4	4	2	4	3–4	3–4	4	4	4	4
Glyphosate (0.75 ae)	6	6	6	6	6	6	6	6	6	6	6	6	6
Halex GT (3.6 pt)	<4	<4	<4	<4	<4	<4	<4	<4	<4	<4	<4	<4	<4
Harmony SG (0.125 oz)	—	—	—	4	4	—	—	12	12	—	—	6	6
Hornet (2.4 oz)	—	6	6	<2*	<2*	<2*	<2*	<2*	<2*	6	6	6	6
Ignite4 (22 fl oz)	6	6	6	4	4	6	6	3*	3*	6	6	6	3*
Ignite4 (29 fl oz)	10	14	10	6	6	8	8	4*	4*	10	12	14	4*
Impact (0.75 fl oz)	—	8	6	6	6	6*	6	6	6	6	8	3	8
Laddok (1.67 pt)	—	8	6	5	5	4	1	6	2	4	4	10	5
Laudis (3 fl oz)	<6*	<6	<6	<6	<6	<6*	<6	<6	<6	<6	<6	<6	<6
Lightning² (1.28 oz)	—	8	3	3	3	3	3	8	8	3*	3	3	3
Marksman¹	4	6	6	6	4	6	6	6	4	6	6	8	6
NorthStar (5 oz)	4	6	6	4	4	3*	6	5	5	9	9	4	4
Option (1.5 oz)	3	2	3	2	2	3*	4	3	3	2	3*	—	3
Permit (0.67 oz)	3*	9	—	2*	2*	—	—	3	3	9	3	2	9
Permit (1–1.33 oz)	12*	14	—	2*	2*	3*	—	6	6	12	6	2	12
Ready Master ATZ5 (2 qt)	4	4	4	4	4	4	4	4	4	4	4	4	4
Require Q (4 oz)	—	1–3*	1–3*	1–3*	1–3*	1–3*	1–3*	1–3	1–3	1–3*	1–3*	1–3*	1–3
Resolve (1 oz)	—	3*	—	3*	3*	3*	—	3	3	3*	—	3*	3*
Resolve Q (1.25 oz)	—	1–3*	—	1–3*	1–3*	1–3*	—	1–3	1–3	1–3*	—	1–3*	1–3
Resource³ (6 oz)	—	—	—	3 lvs	3 lvs	—	—	3 lvs	3 lvs	3 lvs	—	—	6 lvs
Roundup Weather Max5 (22 fl oz)	6	6	6	6	6	6	6	6	6	6	6	6	6
Spirit (1 oz)	6	8	6	3	3	4*	5	4	4	9	9	6	6
Status¹ (5 oz)	4	4	4	4	4	4	4	4	4	4	4	4	4
Steadfast (0.75 oz)	—	—	4	4*	4*	4	—	4	4	—	—	4*	4*
Steadfast ATZ (14 oz)	4	4	4	4	—	4	4	4	4	4	4	4	2
Stout (0.75 oz)	3	—	3	4	4	2–3	—	4	4	—	—	4	4
Yukon (4–8 oz)	12*	14	4	6	6	6	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 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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