Pea aphid - This pale green aphid may be as long as 4 mm and has long, slender cornicles. Hosts do not turn yellow, but may wilt, become stunted, develop a terminal rosette, and produce a lower yield. Nymphs are surrounded by white, frothy masses resembling spittle. It pierces and extracts sap from leaf veins, causing yellowing of leaves, loss of vigor, or death of the plant. Their feeding and egg-laying activities on the lower stem may cause stem breakage and lodging.
Damage is indicated by a white cast to the leaves when viewed from a distance.
This mite is identified by the adult female which is yellowish- to dark green with two or four dark, dorsal spots. They eat or sever roots, thereby causing reduced plant growth or death, especially during drought. Small localized areas of unhealthy plants are often indicative of a white grub infestation. Fluffy soil may also accompany severely damaged spots.