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Threshold Critical in Application Timing
Information from University of Wisconsin Extension Integrated Pest and Crop Management Newsletter
With the ever-changing commodity price of soybeans, many questioned whether the threshold number would change for numerous pests including soybean aphids. The North Central Extension entomologists reviewed the threshold in the summer of 2008 and decided to keep the recommendation at 250 aphids per plant.
The University of Wisconsin Extension Web site notes that growers should base scouting on a sample of 20 to 30 plants throughout the field. These plants are usually at R1 to R5 growth stages, (beginning bloom, first flower to 1/8″ seed in top four nodes).
This threshold level provides a seven-day window to treat fields before the economic yield loss occurs at 1,006 aphids per plant.
For more timely insect management information from the University of Wisconsin, click here.
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