Burke, H.E. 1932 Summary of shade-tree insect activities in California for 1931.. Monthly Bulletin, California Department of Agriculture 21: 358-369.

Notes: Insects discussed include Gossyparia spuria, Ehrhornia cupressi, Pseudococcus gahani, Phenacoccus gossypii, Toumeyella pinicola, Physokermes insignicola, Diaspis piricola, Aonidia shastae, Chionaspis pinifoliae and Lepidosaphes ulmi; hosts; natural enemies.