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May
23
Posted by:
WCM Staff
5/23/2007 3:58 PM
In regards to postemergence herbicides in corn, I think these three simple rules capture most of what needs to be said.
Labelled Stages for Postemergence Herbicides in Corn
Chris Boerboom, Extension Weed Scientist
In regards to postemergence herbicides in corn, I think these three simple rules capture most of what needs to be said.
Three rules for postemergence herbicide applications in corn
1. Spray early to minimize the potential for yield loss from early-season weed competition.
2. Spray at the correct growth stage to reduce the risk of injuring the corn (see table below).
3. Do not spray under windy conditions when drift may damage neighboring crops or properties.
More information about current research related to early-season weed competition can be found in the article “Early-Season Weeds in Corn”, which is printed in this issue.
In the chart, “V” refers to “V-stage”, which describes the number of leaf collars on a corn plant. The leaf collar is region where the leaf blade joins the leaf sheath, which wraps around the stalk. In Figure 1 below, this corn plant has 3 leaf collars (and 3 fully emerged leaves) and is called a V3 corn plant.
Herbicide
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Corn stage
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Accent
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0-20" or V6; to 36" or V10 with drop nozzles
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Accent Gold WDG
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0-12" or V5
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Acetochlor (Harness, etc.)
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0-11"
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Aim
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0-V14
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Atrazine
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0-12"
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Basagran
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no restriction
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Basis
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0-V2
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Beacon
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4-20" or V6; to tasseling with drop nozzles
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Bicep Lite II Magnum
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0-5"
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Buctril
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4 leaf to before tasseling
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Callisto
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0-30" or V8
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Camix
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0-30" or V8
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Celebrity Plus
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4-24" or V6
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Define
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0-V5
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Dicamba (Clarity, etc.)
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0-8" or 5 leaf; to 36" with drop nozzles
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Dimethenamid (Outlook, etc.)
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0-12"
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Distinct
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4-24"; 24-36" with drop nozzles
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Glyphosate (Roundup, etc.)
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0-30" or V8
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G-Max Lite
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0-12"
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Hornet WDG
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0-20” or V6; 20-36" with drop nozzles if harvested for grain
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Impact
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emergence to 45 days before harvest
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Liberty
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0-24" or V7; 24-36" with drop nozzles
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Lightning
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0-20" or V6
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Lumax
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0-12"
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Marksman
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0-8" or 5 leaf
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Metolachor (Dual II Magnum, etc)
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0-40"
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NorthStar
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4-20" or V2 -V6; to 36" with drop nozzles
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Option
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V1-V6; to V7 with drop nozzles
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Pendimethalin (Prowl, etc.)
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0-30" or V8
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Permit
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0-36"
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Priority
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0-V8
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Resolve
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0-12” or V5
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Resource
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V2-V10
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Shotgun
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0-8"; to 12" with drop nozzles
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Status
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4-36” or V2 to V10
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Steadfast
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0-20" or V6
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Steadfast ATZ
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0-12"
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Stinger
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0-24"
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Stout
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0-16” or V5
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Yukon
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0-36"
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2,4-D
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0-8"; to before tasseling with drop nozzles
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Figure 1. V3 corn plant.
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