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 Labelled Stages for Postemergence Herbicides in Corn Minimize
Location: BlogsWisconsin Crop ManagerWeeds    
Posted by: WCM Staff 5/23/2007 4:58 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                                                             
Corn stage
Accent                        
0-20" or V6; to 36" or V10 with drop nozzles
Accent Gold WDG    
0-12" or V5
Acetochlor (Harness, etc.)        
0-11"
Aim                             
0-V14
Atrazine                     
0-12"
Basagran                   
no restriction
Basis                          
0-V2
Beacon                      
4-20" or V6; to tasseling with drop nozzles
Bicep Lite II Magnum                 
0-5"
Buctril                         
4 leaf to before tasseling
Callisto                       
0-30" or V8
Camix                        
0-30" or V8
Celebrity Plus           
4-24" or V6
Define                        
0-V5
Dicamba (Clarity, etc.)               
0-8" or 5 leaf; to 36" with drop nozzles
Dimethenamid (Outlook, etc.)  
0-12"
Distinct                       
4-24"; 24-36" with drop nozzles
Glyphosate (Roundup, etc.)
0-30" or V8
G-Max Lite                 
0-12"
Hornet WDG             
0-20” or V6; 20-36" with drop nozzles if harvested for grain
Impact                                           
emergence to 45 days before harvest
Liberty                        
0-24" or V7; 24-36" with drop nozzles
Lightning                   
0-20" or V6
Lumax                        
0-12"
Marksman                 
0-8" or 5 leaf
Metolachor (Dual II Magnum, etc)
0-40"
NorthStar                   
4-20" or V2 -V6; to 36" with drop nozzles
Option                        
V1-V6; to V7 with drop nozzles
Pendimethalin (Prowl, etc.)
0-30" or V8
Permit
0-36"
Priority                        
0-V8
Resolve                      
0-12” or V5
Resource                   
V2-V10
Shotgun                     
0-8"; to 12" with drop nozzles
Status
4-36” or V2 to V10
Steadfast                   
0-20" or V6
Steadfast ATZ           
0-12"
Stinger                       
0-24"
Stout                           
0-16” or V5
Yukon                         
0-36"
2,4-D                          
0-8"; to before tasseling with drop nozzles
 

Figure 1. V3 corn plant.

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