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Candidatus  Liberibacter solanacearum (Lso) is bacterium transmitted by psyllids to Solanaceae and Apiaceae plants. So far, Lso is found in Europe affecting Apiaceae. In the Mediterranean region,  Bactericera trigonica  is the only known vector of Lso, but the leek-onion psyllid  Bactericera tremblayi  is another widespread psyllid and potential vector of Lso. Commonly, carrot, leek and potato are cultivated in the same zones and it is uncertain if these psyllid species are able to transmit Lso to potato plants. Here, we assessed the transmission of Lso by  B. trigonica  and  B. tremblayi  to potato plants.  B. trigonica  showed preference to ingest from the phloem, settle and oviposit on carrot and celery but not on potato. This was correlated with high Lso transmission rates to both carrot (80%) and celery (70%) but very low to potato (≤3%).  B. tremblayi  preferred leek over carrot and potato, the latter being the less preferred host.  B. tremblayi  readily ingested from the phloem of infected carrots but failed to transmit Lso from carrot to carrot. Our study shows that the risk of Lso transmission from Apiaceae to potato by  B. trigonica  is very low, and that  B. tremblayi  is not a likely vector of Lso.

scientific reports

Risk assessment of ‘Candidatus Liberibacter solanacearum’ transmission by the psyllids Bactericera trigonica and B. tremblayi from Apiaceae crops to potato