Angerilli, N.P.D., Gaunce, A.P., & Logan, D.M. 1986 Some effects of post-harvest fumigation, controlled-atmosphere storage, and cold storage on San Jose scale (Homoptera: Diaspididae) survival on two varieties of apples.. Canadian Entomologist 118: 493-497.

Notes: Quadraspidiotus perniciosus difficult to control on apple in the Okanagan valley, British Columbia, Canada.