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Corn root aphid


  • Adult: Bluish-green or gray, soft-bodied, round 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: Similar to the adults but smaller.
  • Eggs: Females do not lay eggs but give birth to live young. 

Timing of damage: All growing season

Type of damage: Attacks roots and sucks out the sap. Aboveground, plants become tinged with yellow or red and growth is stunted.

Scouting: Dig up 2' of plants in five locations and record the number of plants with live aphids and showing symptoms.

Economic threshold: None established.

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