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Northwest Iowa Extension
Crop and Pest Information
by Todd Vagts
ISU Extension Crops Specialist
Counties Served: Carroll, Calhoun, Crawford, Ida, Monona,
Pocahontas and Sac. |
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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)
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47 Aphids
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82 Aphids
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41 Aphids
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69 Aphids
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55 Aphids
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49 Aphids
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66 aphids
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26 aphids
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35 Aphids
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11 Aphids
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Approximately 850 Aphids
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High Resolution
Click on image for larger View
(Picture size ranges from 580 - 775 KB; 1600 x 1200 pixels)
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47 Aphids
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82 Aphids
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41 Aphids
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69 Aphids
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55 Aphids
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49 Aphids
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66 Aphids
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26 Aphids
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35 Aphids
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11 Aphids
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Approximately 850 aphids
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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
Non-Discrimination and information
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