Scouting For Aphids In Corn

 

 

There are several species of aphids that may be observed in corn fields throughout the growing season. Typically, these populations are managed by natural enemies, but occasionally they can reach very large densities that may warrant insecticide management. We observed two species of aphids in corn at the Volga Research Farm; bird cherry oat aphid, and the English grain aphid. Corn leaf aphid can also be present on corn, but there have been no reports or observations of these in 2016 in South Dakota.

 

 

Bird cherry oat aphids vary in color from dark green to olive. Their distinguishing characteristic is the burnt red-orange patch present at the end of their abdomen (Figure 1).

 

 

English grain aphids are typically light green. Their distinguishing characteristics are their black antennae, cornicles (tailpipes), and joints of each leg (Figure 2).

 

 

Corn leaf aphids are typically bluish green. They are considered to have a boxier shape than other aphid species. These aphids are also noted for having very short antennae and cornicles (tailpipes) (Figure 3).