Lecanium scale (Parentholecanium spp.)
Oystershell scale (Lepidosaphes ulmi)
San Jose scale (Quadraspidiotus perniciosus)
Description, biology and management Small (less than 0.125 inch in length) soft insects beneath various scale coverings. Identify scale based on host plant, and the description of the shape and size of adult males and females, immature crawler stage, and color of eggs.
For biology, life history, monitoring and management
See:
Ash (Fraxinus)-Oystershell scale
Cherry, flowering (Prunus)-San Jose scale
See "Scale insect" in:
Management-chemical control
See Table 1 in: