Sweetman, H.L. 1935 Successful examples of biological control of pest insects and plants.. Bulletin of Entomological Research 26: 373-377.

Notes: Pseudococcus gahani, P. citri, P. nipae, P. filamentosus, Diaspis pentagona, Eriococcus coriaceus, Eulecanium coryli, Asterolecanium variolosum, Icerya purchasi, and Aspidiotus destructor, mentioned as pest species; Dactylopius opuntiae, D. ceylonicus, D. confusus, D. newsteadi, and D. coccus mentioned as beneficial for control of Opuntia spp.