Horn, D.J. 1988 . Ecological Approach to Pest Management. Guilford Press New York 285 pp.

Notes: The chapter on broad-spectrum chemical insecticides mentions cottony cushion scale, olive scale and citrus scales. California red scale and hemlock scale are mentioned in the chapter on insects in ecological communities. California red scale, black pineleaf and hemlock scale are mentioned in the chapter on insect-plant interactions. Cottony cushion scale is also mentioned in the chapter on biological control and cottony maple scale is mentioned in the chapter on integrated pest management.