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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]

How Many Soybean Aphids?

Determining the number of Aphids per leaf can be a challenge. 

Use these pictures as a reference
(The numbers are pretty close, but not exact)

We think 40 aphids per leaflet (3 leaflets per leaf) may be significant stress to still warrant treatment, but there is no research on this.
(Brian Lang, ISUE Crop Specialist)

Low Resolution

Click on image for larger View
(Picture size ranges from 52 to 58 KB; 640 x 480 pixels)

47 Aphids

82 Aphids

41 Aphids

69 Aphids

55 Aphids

49 Aphids

66 aphids

26 aphids

35 Aphids

11 Aphids

Approximately 850 Aphids

 

High Resolution

Click on image for larger View
(Picture size ranges from 580 - 775 KB; 1600 x 1200 pixels)

47 Aphids

82 Aphids

41 Aphids

69 Aphids

55 Aphids

49 Aphids

66 Aphids

26 Aphids

35 Aphids

11 Aphids

Approximately 850 aphids

 

Return to the Soybean Aphid page

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 08/27/03

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