An invasive sap-sucking insect that kills pines has led to the removal of more than 5,000 trees across Adelaide's north-east, with residents lamenting the loss of the area's charm. . newsiviewlistenLoading ABC NewsNews HomeHighbury residents question tree removal to stop giant pine scale spreadShareShare articleHighbury residents question tree removal to stop giant pine scale spreadBy Natarsha Kallios. Trees have been removed due to outbreaks of giant pine scale at Highbury.