Identification tip: Walnut aphids feed on the lower
leaf surface and are much smaller than dusky-veined aphids.
Dusky-veined aphid (nymphs)
tip: Dusky-veined aphid nymphs have dark, banded spots
on the back. These spots are much less pronounced or absent
on the nymphs of the walnut aphid. They feed along the
midvein on the upper leaf surface.