Scout Your Late and Re-Planted Soybean Fields for Rising Soybean Aphid Numbers

Shawn P. Conley and Christian Krupke

A majority of the Wisconsin soybean crop in well into the R6 growth stage. Some of these fields are colonized by low soybean aphid populations. However there are numerous acres of late planted or re-planted soybeans across the upper Midwest that are still at earlier reproductive growth stages (R1-R5). Today I have received calls/texts ranging from the WI/IL border to north of Green Bay stating that populations in these late planted fields are at or above the 250 aphids/plant threshold. If these numbers are climbing and winged aphids are not present an insecticide treatment is likely warranted. The 250-aphid threshold applies across R1-R5, but the earlier the growth stage of the plant, the higher the risk of yield loss.

Once beans reach R6, the threat of yield loss from soybean aphid has passed.

For more information on soybean aphid management, please visit: https://soybeanresearchinfo.com/soybean-pest/soybean-aphid/#