Cressman, A.W., & Dawsey, L.H. 1936 The comparative insecticidal efficiency against the camphor scale of spray oils with different unsulphonatable residues.. Journal of Agricultural Research 52(11): 865-878.

Notes: Chemical control studied against Pseudaonidia duplex, on Cinnamomum camphora plants in the laboratory. Previous chemical control experiments against Aspidiotus perniciosus is also mentioned.