Identification & Incidence: At late whorl and early tassel stages of corn development, blue-green aphid colonies may develop which generate honeydew that disrupts pollination. Feeding activity of corn leaf aphid (CLA) may also delay development of corn under drought stress.
Sampling & Assessment: Evaluation of CLA is based on inspection of 20 plants at 3 or more locations to determine percent of stand having CLA colonies. When 50% or more of stand have colonies, rescue action may be warranted. Presence of insect predators (Lady beetles, etc.) indicate a potential decline in CLA activity.
Management Options: Heavy infestations on stands under stress may warrant rescue treatment. Natural predator activity often controls infestations.