Genetic Diversity of Phytoplasmas Associated With Jujube Witches' Broom Disease in Ziziphus Jujube Mill. 'Dongzao'

Liu, Peng; Liu, Z.G.; Yuan, Zhibo; Xiao, Jian; Zhao, Zhenzhen; Zhao, Jinming; Liu, M.J.

doi:10.17660/actahortic.2013.993.18

Cited by 1 publication

(1 citation statement)

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“…The pest kills 3‐5% or even more jujube trees each year in many orchards (Zhao et al., ), but several resistant accessions of Ziziphus jujuba are available (Liu et al., ; Tian et al., ). The ‘Lizao’ and ‘Dongzao’ jujube varieties appear to be susceptible to phytoplasma infection (Tian et al., 2000; Peng et al., ). Production of phytoplasma‐free plants of Chinese jujube can be achieved by cryopreservation (Wang et al., ,)…”

Section: Appendix D – Impacts On Other Natural Hostsmentioning

confidence: 99%

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.

Bragard¹,

Dehnen‐Schmutz²,

Gonthier³

et al. 2020

EFS2

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Following a request from the European Commission, the EFSA Panel on Plant Health performed a pest categorisation of nine phytoplasmas of Cydonia Mill., Fragaria L., Malus Mill., Prunus L., Pyrus L., Ribes L., Rubus L. and Vitis L. (hereafter "host plants") known to occur only outside the EU or having a limited presence in the EU. This opinion covers the (i) reference strains of 'Candidatus Phytoplasma australiense', 'Ca. P. fraxini', 'Ca. P. hispanicum', 'Ca. P. trifolii', 'Ca. P. ziziphi', (ii) related strains infecting the host plants of 'Ca. P. aurantifolia', 'Ca. P. pruni', and 'Ca. 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 EU. 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 EU environmental conditions. The introduction of these phytoplasmas in the EU 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 EFSA to qualify as potential Union quarantine pests, and they do not qualify as potential regulated non-quarantine pests, because they are non-EU phytoplasmas.

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