Pest description and crop damage Adults are brown and about 0.25 inch long. They chew oblong shotholes on the leaves. Mature larvae are greenish yellow and are about 0.37 inch long. They skeletonize leaves. This beetle, an introduced species from Canada, currently is only in northwest Washington.
Chemical Control of Nursery Pests
Soil drenches are particularly effective but must be made several weeks before feeding activity is anticipated.
For more information
Johnson, W.T. and H.H. Lyon (1991), Insects That Feed on Trees and Shrubs, 2nd ed., Cornell University Press (p. 224).