Includes Parthenolecanium corni
Pest description and damage Lecanium scale are most noticed as the females expand in size in the spring. As females swell in the spring, they produce large egg masses under the scale and release considerable honeydew that coats nearby foliage. The female lecanium scale are about 0.13 inch in diameter and vary from reddish-brown to dark brown in color. The adults are oval and raised, resembling small "helmets," "turtles," or bumps on branches and stems. Male scale are smaller, fairly flat, and oblong. Pale yellow crawlers feed mostly on the underside of leaves.
For biology, life history, monitoring and management
Ash (Fraxinus)-San Jose scale
See "Scale insect" in:
See Table 1 in: