Imms, A.D. 1931 Biological control. I. Insect pests.. Tropical Agriculture 8: 98-102.
Notes: Scale insects discussed include Icerya purchasi, Pseudococcus nipac, P. filamentosus, P. gahani, P. citri, Eriococcus coriaceus, Saissetia oleae, Chrysomphalus aurantii, Lepidosaphes beckii and Diaspis pentagona.