|Soybean aphid biological control|
Your Soybean Checkoff.
Soybean aphid - agronomic impact
|Signs of aphid feeding.
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Photo credit: University of Wisconsin
The impact of aphids on yield depends how many aphids are feeding and when. Soybeans are most at risk for yield loss when aphid populations increase quickly during R1- to R4 growth stages, when blooms and young pods are most susceptible to stress.
Aphid populations tend to be higher and more damaging in fields or parts of fields where plants are already stressed from dry soil, soil fertility factors, weather conditions, other diseases, or in fields that are planted late. Scout these fields most closely.
Factors influencing aphid populations
Aphid populations vary widely from year-to-year and field to field, depending on
Aphids can transmit soybean viruses
A separate issue from the direct damage caused by aphid feeding is the ability of soybean aphids to spread virus diseases, such as soybean mosaic virus, from plant to plant as they feed.
Virus infection that occurs in early growth stages presents the greatest risk of yield loss and reduced seed quality, compared to infection later in the season.
Ecoonomic Impact of the Soybean Aphid - Integrated Plant Management newsletter, ISU