McLeod, J.H. 1962 Biological control of pests of crops, fruit trees, ornamentals and weeds in Canada up to 1959.. A Review of the Biological Control Attempts Against Insects and Weeds in Canada. (Technical Communication No. 2, Trinidad) Commonwealth Agricultural Bureaux Farnham Royal, England 216 pp.

Notes: Coccus hesperidum, Lepidosaphes ulmi, Phenacoccus aceris, Planococcus (Pseudococcus) citri, Pseudococcus comstocki and P. maritimus are reviewed.