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Grape Colaspis

Grape Colaspis larvae feed on root hairs and may eat narrow strips from the roots. Damage has been observed on both corn and soybean roots. The denuded roots cannot obtain moisture and nutrients efficiently. Injury symptoms above ground (see picture) include stunting, wilting, purpling of the leaves and stem (phosphorus deficiency), and browning of the tips and edges of the leaves.

Resources

Grape Colaspis
Purdue University - Field crops IPM

Grape Colaspis
University of Missouri Extension - WEB site