Pree, D.J., Menzies, D.R., Marshall, D.B., & Fisher, R.W. 1985 Influence of spray volumes on control of San Jose scale (Homoptera: Diaspididae).. Proceedings of the Entomological Society of Ontario 115: 19-23.

Notes: Applications in Ontario of superior oil to small plum trees in spray volumes smaller than 2400 litres/ha were equally effective against Quadraspidiotus perniciosus; none of the treatments, including combinations of oil sprays of diazinone were effective in preventing the resurgence of scale populations.