McGugan, B.M., & Coppel, H.C. 1962 Biological control of forest insects -- 1910-1958.. 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: Carulaspis visci and Lecanium tiliae are reviewed.