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Corn root aphid

Description

  • Adult: Bluish-green or gray round, soft-bodied insect about the size of a pinhead. Subterranean and remain in the soil year-long. Secrete a sticky sugary substance called honeydew and feed on plant juices through the roots.
  • Nymphs: Look like adults but smaller.
  • Eggs: Females do not lay eggs but give birth to live young.
     

Timing of damage: VE to V12

Type of damage: Wilted, yellow or brown and/or stunted plants.

Scouting: Dig up wilted plants and inspect roots for aphids. Corn-field ants feed on the honeydew these aphids produce, so anthills will often be seen at the base of infected plants.

Economic threshold: No established threshold. In good conditions, plants will outgrow damage. Tillage can also help reduce aphid numbers.

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