Distribution of San Jose scale, Quadraspidiotus perniciosus (Comst.), in the Adelaide Hills.
Quadraspidiotus perniciosus (Comst.) was first found in South Australia in 1958 on deciduous fruit trees in the lower Murray area [see RAE/A 49, p. 494] and was found in the Adelaide Hills area in 1962. In connection with quarantine regulations that had been introduced against the scale, a survey of orchards and home gardens in the Adelaide Hills was undertaken in 1974. Chemical control measures had failed to control Q. perniciosus, which was present in about one-quarter of the properties in the quarantine area and was also established outside the boundary in the north-western and eastern districts. Because of this and control measures that are already undertaken, as well as the fact that the export of pome fruits to Europe has almost ceased, the quarantine proclamations against Q. perniciosus in the Adelaide Hills were revoked. Oyster-shell scale [Q. ostreaeformis (Curt.)] was found throughout the area, infesting 74% of the home properties visited and the 7 pome-fruit orchards.