Grape Colaspis

John Van Duyn, North Carolina State University, Entomology Extension Specialist

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Grape colaspis:Grape colaspis passes the winter in the soil as a grub from the previous season. Typically, the adults will only lay eggs in legume plantings (e.g. soybean) during the previous season and, therefore, if current year soybean seedlings are to have a problem, they must follow last year's soybean crop. Rotation eliminates grape colaspis problems. After overwintering below the plow layer, grape colaspis grubs move near the surface in later May and feed on seedling roots. The grubs are small (to 5/16 inch), "C" shaped, white larvae with a brown head capsule and neck shield. Damaged seedlings have few lateral roots and the underground stem may show feeding on the bark. Seedlings may die or be stunted from the feeding. This insect will almost always be restricted to spots in the field and is most abundant on organic soils. Grape colaspis damage is often wrongly interpreted as nematode damage, however, it can be identified by the characteristic root and stem feeding signs. Often the presence of small, light brown adult beetles (less than 1/4 inch) feeding in the plant terminals will aid problem identification. There is no remedial treatment. Replanted soybeans are seldom attacked since the larva responsible for the original injury will have transformed into beetles and emerged. Foliage feeding by the emerged adults is insignificant.

Soybean Page

Other Resources

  1. North Carolina Agricultural Chemicals Manual
  2. North Carolina Cooperative Extension Service

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This page ( was created by John W. Van Duyn Ph D. Extension Entomologist, Wayne Modlin, Res. Tech. III.

Date Created 2/22/00.
Last revised on 2/4/04.

Published by North Carolina Cooperative Extension Service

Distributed in furtherance of the Acts of Congress of May 8 and June 30, 1914. Employment and program opportunities are offered to all people regardless of race, color, national origin, sex, age, or disability. North Carolina State University at Raleigh, North Carolina A&T State University, U.S. Department of Agriculture, and local governments cooperating.

CAUTION : The information and recommendations in these Notes were developed for North Carolina conditions and may not apply elsewhere.