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ISU Extension Logo

Northwest Iowa Extension
Crop and Pest Information
by Todd Vagts
ISU Extension Crops Specialist
Counties Served:  Carroll, Calhoun, Crawford, Ida, Monona, Pocahontas and Sac.

   
[Home][ISU Extension][IA State University]

Soybean Aphid

Estimate aphid population growth potential with the SAGE model developed by researchers at the University of MN.

Population growth estimates for Carroll and Pocahontas, IA on August 1is as follows

Soybean Aphid Estimated Population Growth          
           
Location:  Carroll, IA        
Current Date:  08/15/2005        
Est. Double time:  2.0        
           
  Aphids/Plant
Today's Population 10 20 40 80 16
Population in 7 days 114 229 457 914 1829
           
  Days
Days to Threshold 9 7 5 3 1
         
         
Soybean Aphid Estimated Population Growth          
           
Location:  Pocahontas, IA        
Current Date:  08/15/2005        
Est. Double time:  2.0        
           
  Aphids/Plant
Today's Population 5 10 20 40 80
Population in 7 days 116 232 464 927 1855
           
  Days
Days to Threshold 9 7 5 3 1

 

Visit ISU's www.soybeanaphid.info

A new ISU soybean aphid publication is available online at:  http://www.extension.iastate.edu/Publications/SP247.pdf

Soybean Aphid (rapid) scouting procedure:  http://www.soybeans.umn.edu/crop/insects/aphid/aphid_sampling.htm

ISU Integrated Crop Management Newletter Articles:
Aphids found in Iowa, treatment thresholds (06/14/04):
http://www.ipm.iastate.edu/ipm/icm/2004/6-14-2004/soyaphid.html
Scouting and Mngt. considerations (06/14/04):
http://www.ipm.iastate.edu/ipm/icm/2004/6-14-2004/soythreshold.html
Scientific papers published (05/03/04):
http://www.ipm.iastate.edu/ipm/icm/2004/5-3-2004/soybeanaphid.html

University of Minnesota: 
http://www.soybeans.umn.edu/crop/insects/aphid/aphid.htm

Plant Health Inititative (Excellent quick reference):
http://www.planthealth.info/soyaphid.htm
http://www.planthealth.info/soyaphid/sbatmt.htm (labeled insecticides)

University of Wisconsin: Treatment threshold and Soybean Growth Stage Comparison
http://www.planthealth.info/soyaphid/uwexsoystage.pdf
 


Current Data (2005)

2005 Aphid Population Growth Parameters for N.W. Iowa (coming soon)
Source, transport and local condition details.

2004 Aphid Population Growth Parameters for N.W. Iowa
Source, transport and local condition details.


Take the survey:  Soybean Aphid Insecticide Treatment Yield Comparison

2003 Survey Results (PDF file)
2003 Survey Results Graphed (PDF file)


Click on this hyperlink for Pictures of Soybean Aphid, Honeydew, sooty mold, plant stress symptomology and beneficial insects from central IA.


Having difficulty determining how many aphids you have per leaf?  Use these pictures as a reference.


Other Information Sources
University of Minnesota: 
http://www.soybeans.umn.edu/crop/insects/aphid/aphid.htm
Insecticide and application performance trials: 
 http://www.soybeans.umn.edu/crop/insects/aphid/aphid_management.htm

University of Wisconsin:
Aphid Biology: http://www.plantpath.wisc.edu/soyhealth/aglycine.htm
Aphid Publication:  http://www.plantpath.wisc.edu/soyhealth/virus/aphid2003.pdf

Iowa State University:
ICM Newsletter: http://www.ipm.iastate.edu/ipm/icm/

North Dakota State University: 
http://www.ext.nodak.edu/extpubs/plantsci/pests/e1232w.htm


South Dakota State University
http://plantsci.sdstate.edu/ent/entpubs/FS914_Soy_Aphid2.pdf

Soybean Aphid Watch: 
http://www.pmcenters.org/Northcentral/Saphid/Aphidindex.htm

Plant Health Initiative (Soybean Aphid Research Review, 2004)
http://www.planthealth.info/aphidinsert/aphidinsert.htm

 

Photos
http://www.inhs.uiuc.edu/cbd/aphid/photos.html

Scouting form
http://www.soybeans.umn.edu/pdfs/MultiStateSoybeanAphidSurvey.pdf

Stay tuned for more, updated information as it becomes available.

This information is also available as a pdf file

Return to NW Iowa Crops homepage

Todd Vagts
Iowa State University Extension
Field Crops Specialist
1240 D. Heires Avenue 
Carroll, IA 51401 
Office: 712-792-2364; Cell: 712-249-6025;  Fax: 712-792-2366
Email: vagts@iastate.edu  


For questions or comments please respond to vagts@iastate.edu

This page last updated on 08/15/05

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