Grape Colaspis

Pest ID

 

  • Grape colaspis larva is 1/8 to 1/6 inch long, slightly curved and resembles a miniature white grub. It has a plump, white body with a tan head and prothoracic shield (the plate just behind the head). There will be 3 pairs of short legs, while bunches of hairs arise from bumps on the underside of the abdomen.

 

Symptoms

 

  • Grape colaspis larvae feed on root hairs and may eat narrow strips from the roots. Stripped roots cannot obtain moisture and nutrients efficiently.
  • Injury symptoms above ground include stunting, wilting, purpling of the leaves and stem (indicating a phosphorus deficiency), and browning of the tips and edges of the leaves. Severe infestations may cause plant death and reduced plant populations.
  • Injury is more severe when weather conditions retard the growth of the seedlings.

 

Photo: Grape colaspis larvae

Life Cycle

 

  • The grape colaspis completes only 1 generation per year in the Corn Belt.
  • It passes the winter as a small larva in the soil 8 to 10 inches in depth. Larvae become active early in the spring, feed on the roots of host plants, and complete their development from mid-June to early July in the Corn Belt.

 

Photo: Grape Colaspis

Management

 

  • No soil insecticides are currently labeled for grape colaspis. In extreme cases, replanting is the only option.

 

SOURCE: University of Illinois Extension Publication Grape Colaspis a quick review (May 11, 2001)

Photos courtesy of Marlin E. Rice.


 
 
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