With the entry in force of the new Plant Health Ordinance (PGesV), from 1 January 2020, particularly dangerous harmful organisms (PDHOs) are assigned, according to objective criteria, to three different main categories:
Quarantine pest are PDHOs with potential economic implications, which either do not occur, or only occur locally, in Switzerland. These organisms are subject to a general ‘notification and control’ obligation in Switzerland: the fire bacterium (Xylella fastidiosa) and Japanese beetle (Popillia japonica) are two examples of organisms falling into this category.
Regulated non-quarantine pests are PDHOs that are widespread in Switzerland, which are spread primarily via specific host plants intended for planting. Owing to their pervasiveness, they do not – or do not any longer – meet the criteria for quarantine pests. However, since their occurrence in planting stock carries a high potential for damage, phytosanitary measures are being taken with respect to the marketing of healthy propagation material – for example, the Sharka virus (plum pox virus), the fire blight bacterium (Erwinia amylovora) and the pathogen of apple proliferation (Candidatus Phytoplasma mali) are considered to be regulated non-quarantine pests.