McLaren, G.F. 1989a Phenology of oystershell scale Quadraspidiotus ostreaeformis (Curtis) in Central Otago.. New Zealand Journal of Crop and Horticultural Science 17(3): 215-219.

Notes: Abstract: Biology; found on Malus sp. and Prunus domestica; not a serious pest but a quarantine problem for exported fruit because of its similarity to Comstockaspis perniciosus; parasites include Aphytis albidus and Encarsia citrina. Keywords: biology.