–by Dr. Jeff Whitwoth
Every field sampled throughout North Central Kansas last week had pea aphids (fig. 3) and many had scattered infestations of cowpea aphids. Pea aphids are usually considered more of a cool weather insect while cowpea aphids more of a warmer (i.e. later in the season) insect, so that just illustrates the weather roller coaster we have been experiencing this spring. Treatment recommendations for pea aphids will probably work for cowpea aphids and/or mixed populations, which calls for 50+ aphids/stem, to justify an insecticide application.