Hagen, K.S., Van den Bosch, R., & Dahlsten, D.L. 1971 The importance of naturally-occurring biological control in the western United States.. Biological Control. Plenum Press New York 511 pp.

Notes: [Proceedings of an AAAS Symposium on Biological Control, held at Boston, Massachusetts December 30-31, 1969.] Species mentioned include Hemiberlesia lataniae, Matsucoccus sp., Nuculaspis californica, Orthezia annae, Phenacaspis pinifoliae, Physokermes sp. Pineus sp., and Pseudococcus adonidum.