Cressman, A.W., & Broadbent, B.M. 1943 Effectiveness of cube and derris resins in a tank mix and an emulsive oil against California red scale.. Journal of Economic Entomology 36(3): 439-441.

Notes: Experiments with a tank-mix oil showed that addition of derris resins increased the mortality of the California red scale but that 1.14 per cent of resins in oil was no more effective than 0.57 per cent. in one type of emulsive oil, scale mortality was proportionate to the amount of cube or derris resins in the oil over a wider range of resin concentrations.