grape colaspis adult MER copy.jpg

Grape colaspis grub


  • Adult: Small brown beetle with yellowish lines running down the length of its wing covers.
  • Larvae: Small white grubs with tan or orange heads and covered in tiny hairs.
  • Eggs: White to yellow and laid in clusters of about three dozen in the soil. 

Timing of damage: VE to V6

Type of damage: Larvae feed on the surface tissue of corn roots, causing wilting and sometimes plant death.

Scouting: Dig up plants and inspect roots and surrounding soil for larvae.

Economic threshold: There is no established threshold as there are no known rescue treatments for grape colaspis damage. Infestations should be noted in future planting decisions.

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