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Psyllids (Hemiptera: Psylloidea) can transmit the phloem restricted bacterium ' Candidatus Liberibacter solanacearum' (Lso). In Europe, Lso causes severe losses to carrot and represents a threat to the potato industry. A rising concern is Lso transmission from carrot to potato and within potato, and this has driven the need for monitoring populations of psyllid species which could serve as vectors on both crops. This would provide a fundamental understanding of the epidemiology of Lso. Different sampling methods were used to survey populations of psyllid species in commercial carrot and potato fields in central and eastern mainland Spain from 2015 to 2017. Two psyllid species, Bactericera  trigonica and Bactericera  nigricornis were found on carrot and potato crops. In carrot fields the most abundant species was B.  trigonica (occurring from crop emergence to harvest); whereas in potato crops the most abundant psyllid species was B.  nigricornis . Depending on field location, the maximum psyllid populations occurred between June and October. Since B.  nigricornis was found on both carrot and potato and is the only psyllid species able to feed and reproduce on both these crops in Europe, there is the potential risk of Lso transmission from carrot to potato.

Seasonal Abundance of Psyllid Species on Carrots and Potato Crops in Spain