Burke, H.E. 1930 Which insects are the important enemies of shade, park and ornamental trees in the Pacific states.. Journal of Economic Entomology 23: 783-785.

Notes: Species mentioned include Gossyparia spuria, Lepidosaphes ulmi, Pseudococcus spp., Saissetia oleae, Lecanium corni, Adelges cooleyi, Chionaspis pinifoliae, C. salicis-nigrae, Diaspis piricola, Lecanium coryli, Chrysomphalus aurantii, Aspidiotus perniciosus, A. camelliae, Icerya purchasi and Saissetia hemisphaerica.