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Under plant health legislation, a number of plant pests and diseases are classified as quarantine organisms and are therefore subject to statutory control.
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Xylella fastidiosa is a bacterial disease with many sub species and strains not known to occur in the UK.
Phytophthora species are fungus like plant pathogens. Phytophthora ramorum and P. kernoviae are exotic species that cause damage to trees, shrubs and other plants. Government policy on P. ramorum and P. kernoviae is to reduce the spread and impact of these pathogens in the wider environment.
The Citrus longhorn beetle (Anoplophora chinensis) is a serious invasive pest that is found in South East Asia, with outbreaks in Italy, Croatia and Turkey. It can infest a very wide range of broadleaved trees and would be a major threat to horticulture and the wider environment if they became established.
Oriental chestnut gall wasp, Dryocosmus kuriphilus, is an insect of Asian origin which affects sweet chestnut trees in the Castanea family of trees. The only species of the Castanea family grown in significant numbers in Britain is the European sweet chestnut (Castanea sativa).
Asian longhorn beetle, Anoplophora glabripennis, is a serious invasive pest that is found in East Asia. Asian longhorn beetles and the closely related Citrus longhorn beetle can infest a very wide range of broadleaved trees and would be a major threat to horticulture and the wider environment if they became established.
Zebra chip disease of potato Candidatus Liberibacter solanacearum is a serious pest of potato in the Americas and New Zealand. In November 2016 it was detected on potatoes for the first time anywhere in the EU by Spanish authorities in the autonomous region of Cantabria.