Feeding results in perforations of the leaf surface, leaving an extensive lacy network of veins not consumed by beetles. This first generation causes most of the damage. Pale yellow larvae form nest at the tips of branches in mid to late summer. The leaves develop light green nipple-shaped galls on the underside of leaves. No control is necessary.
Injured leaflets form a pod around the midge larvae.
These pods eventually turn brown and fall. Repeat treatment every 10 to 14 days until early summer. Junipers are also affected. The scale appears as a hardened brown shell that is tightly attached to the bark. Leaves may become sticky and discolored with heavy feeding.