Smith, H.S., Essig, E.O., Fawcett, H.S., Peterson, G.M., Quayle, H.J., Smith, R.E., & Tolley, H.R. 1933 Efficacy and economic effects of plant quarantines in California.. Bulletin (Connecticut Agricultural Extension Station) No. 553.

Notes: Insects discussed in relation to plant quarantines include San José scale, cottony cushion scale, black scale, red scale, purple scale, citrus mealybug, citricola scale, citrophilus mealybug, parlatoria date scale, Chrysomphalus dictyospermi, Aspidiotus britannicus and Howardia biclavis.