Plant parts affected

Leaves, stem

Initial diagnosis:

"Aphids are small, soft-bodied insects, Female is yellowish-green, gray-green, or olive green while the male is olive-green to brown in color. Nymphs look like the adult."

Symptoms:

The nymphs and adults suck the sap from plants, particularly from the young leaves or ears in large numbers

Damage type:

Aphid feeding can cause direct damage, by reducing yields by up to 10% and by reducing seed size.