EPPO Platform
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Diaspidiotus perniciosus (Comstock) Cockerell, 1899 San José scale


Although D. perniciosus is not well suited to UK environmental conditions, it is likely to be able to establish in southern England if it entered on nursery stock. However, damage would not be expected in most years since only one generation is likely to be possible, and economic damage is only reported in regions with multiple generations per year. Given that the organism is widely distributed elsewhere in Europe I would support repeal of 2006/91/EC to allow plant health resources to focus on pests of more immediate concern.


  • Comstockaspis perniciosa


  • Corylus avellana
  • Juglans regia
  • Malus
  • Prunus cerasus
  • Pyrus communis


Type File Size
Pest Risk Analysis Download 109,96kB

PRA Area

  • United Kingdom