Griffiths, J.T., & Fisher, F.E. 1949 Residues on citrus trees in Florida. I. Changes in insect populations following the use of different chemical materials used at the same amounts of residue per 100 gallons of spray.. Journal of Economic Entomology 42(5): 829-833.

Notes: Populations of Lepidosaphes beckii and Chrysomphalus aonidum increase abnormally following the use of certain chemical sprays.