Grape colaspis, Colaspis brunnea (Fabricius)
This is taken primarily from an
extension bulletin by D. G. Pfeiffer & P. B. Schultz, entitled
"Major Insect and
Mite Pests of Grape in Virginia" (Va. Coop. Ext. Serv. 444-567 (1986))
This beetle passes the winter in the larval
stage. Development is
completed in the spring and adults emerge in June and are present
through August. Adult beetles are light brown, about 5 mm long,
with longitudinal rows of evenly spaced punctures on the elytra,
or wing covers. Feeding marks are elongate oval scars. Damage
is usually dispersed, occurs after foliage is developed, and is
considered minor. Besides grape foliage, grape colaspis adults
feed on strawberry, apple and a variety of vegetable crops. Eggs are
deposited in the soil during summer and fall. Highly creviced
soils, such as clay loam, are preferred. Larvae feed on roots of
grasses, clover, soybean, and rice until cold weather; larvae are
not known to feed on grape. There is one generation per year.
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