Sadof, C.S. 1992 . Scale insects on shade trees and shrubs. Ornamental insects. Dept. Entomology, Purdue Univ. Extension Service West Lafayette, IN 6 pp.

Notes: Abstract: Topics covered include general scale life cycle, chemical and biological control; review of 15 common scales including brief field descriptions, hosts, and period of crawler activity; damage caused by infestation. Keywords: biological control; biology.