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Situation of Xylella fastidiosa in the Alicante outbreak of Spain and phytosanitary measures adopted

AuthorsFerrer, A.; Roselló, M.; Landa, Blanca B. ; Dalmau, Vicente
Issue DateOct-2019
Citation2nd European conference on Xylella fastidiosa (2019)
AbstractIn June 2017, Xylella fastidiosawas detected in a plot of almond trees showing typical symptoms of leaf scorch in the municipality of El Castell de Guadalest (Alicante, Comunidad Valenciana, Spain). It was the first detection of the bacterium in the Iberian Peninsula (mainland Spain). Immediately, the regional Plant Health Service adopted all the phytosanitary measures in accordance with Comission Implementing Decision 2015/789 of 18 May, to prevent the introduction and spread within the EU of X. fastidiosa. The current demarcated area (DA), that now covers 134,581 hectares, has been increasing since the first detection due to surveillance, sampling and molecular analysis activities. In fact, in the DA during 2017 and 2018 more than 18,000 samples from different plant species have been sampled during a seasonalperiod favourable for the detection of the bacterium. In 2017, 201 samples out of a total of 7,650 samples, all from almond trees, were positive for X. fastidiosa. In 2018, 11,069 samples were taken in the DA, and X. fastidiosawas detected in 1,157 of them, and not only in almond trees (95.6% of thepositives) but also in other species: Polygala myrtifolia(1.4%), Rosmarinus officinalis(0.3%), Helichrysum italicum(0.9%), Prunus domestica(0.3%), Prunus armeniaca(0.7%), Rhamnus alaternus(0.3%), Calicotome spinosa(0.2%) and Phagnalon saxatile(0.3%). All of these new host species were found around infected almond trees.Up to now, all the MLST analysis performed on samples from more than 39 different municipalities in the DA, in almond and other hosts, showed that only subspecies multiplexand the same sequence type, ST-6,is present in the DA. In addition, the Plant Health Service have also carried out periodical samplings of potential vectors, and X. fastidiosahas been detected in specimens of both Philaenus spumariusand Neophilaneus campestris.All specimens analysed were infected by the subspecies multiplex and ST-6 as confirmed by MLST analysis. Eradication measures have been taken since the first detection, and so far more than 40,000 almond trees have been removed and shredded according to the Comission Decision.
DescriptionTrabajo presentado en la 2nd European conference on Xylella fastidiosa (how research can support solutions), celebrada en Ajaccio el 29 y 30 de octubre de 2019.
Appears in Collections:(IAS) Comunicaciones congresos
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