Pest categorisation of the non‐EU phytoplasmas of Cydonia Mill. Fragaria L. Malus Mill. Prunus L. Pyrus L. Ribes L. Rubus L. and Vitis L.

摘要

Following a request from the European Commission, the Panel on Plant Health performed a pest categorisation of nine phytoplasmas of Mill. L Mill L L L L L. (hereafter “host plants”) known to occur only outside the or having a limited presence in the . This opinion covers the (i) reference strains of ‘ Phytoplasma australiense’, ‘ . P. fraxini’, ‘ . P. hispanicum’, ‘ . P. trifolii’, ‘ . P. ziziphi’, (ii) related strains infecting the host plants of ‘ . P. aurantifolia’, ‘ . P. pruni’, and ‘ . P. pyri’, and (iii) an unclassified phytoplasma causing Buckland valley grapevine yellows. Phytoplasmas can be detected by available methods and are efficiently transmitted by vegetative propagation, with plants for planting acting as a major entry pathway and a long‐distance spread mechanism. Phytoplasmas are also transmitted in a persistent and propagative manner by some insect families of the Fulgoromorpha, Cicadomorpha and Sternorrhyncha (order Hemiptera). No transovarial, pollen or seed transmission has been reported. The natural host range of the categorised phytoplasmas varies from one to more than 90 plant species, thus increasing the possible entry pathways. The host plants are widely cultivated in the . All the categorised phytoplasmas can enter and spread through the trade of host plants for planting, and by vectors. Establishment of these phytoplasmas is not expected to be limited by environmental conditions. The introduction of these phytoplasmas in the would have an economic impact. There are measures to reduce the risk of entry, establishment, spread and impact. Uncertainties result from limited information on distribution, biology and epidemiology. All the phytoplasmas categorised here meet the criteria evaluated by to qualify as potential Union quarantine pests, and they do not qualify as potential regulated non‐quarantine pests, because they are non‐ phytoplasmas.