Bird-cherry oat aphid


  • Adult: Olive green or dark green, round, soft-bodied and with a rust-colored spot on the posterior end. Appear in clusters in the leaves and upper cornstalk. Prefer cereal grains but will also feed on corn. Secrete a sticky sugary substance called honeydew.
  • Nymphs: Similar to the adults but smaller.
  • Eggs: Females give birth to live young. 

Timing of damage: Fall and spring

Type of damage: Aphids feed on plant sap. Plants may have rolled leaves and fishhooked heads and be covered with honeydew.

Scouting: Examine plants for aphids in various field locations to determine a field-wide average.

Economic threshold: An average of 20 or more aphids per tiller and fewer than 10% of tillers with parasitized aphids or lady beetles.

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