Ewart, W.H., Elmer, H.S., & Gunther, F.A. 1951 Parathion treatments for the control of citricola scale on citrus in California.. Journal of Economic Entomology 44(4): 598-603.

Notes: Experimental results with three types of parathion treatments applied for the control of citricola scale, Coccus pseudomagnoliarum, during the 4-year period from 1947 to 1950, inclusive, are reported. Abnormally high populations of soft (brown) scale, Coccus hesperidum L., have occurred in some groves following parathion treatments.