Weigel, C.A., & Broadbent, B.M. 1924 Lubricating-oil emulsion as a control for Chrysomphalus aonidum in greenhouses.. Journal of Economic Entomology 17: 386-389.

Notes: The need for a more efficient contact insecticide for hardy ornamentals in greenhouses suggested the desirability of testing lubricating oil emulsion which had proved so effective for white flies in Florida, and recently against San Jose scale. The results of these investigations demonstrate that spraying once with a 1:50 "boiled" lubricating-oil emulsion, provided it is thoroughly done, will give a very satisfactory control of the Florida red scale, without injury to hardy ornamental greenhouse plants.