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The bacterium Candidatus Liberibacter solanacearum (Lso) is present in Europe, North and Central America, North Africa and Oceania. However, the distribution of individual haplotypes is geographically limited and related to the distribution of the specific vector. Currently, the vector Bactericera cockerelli and the haplotypes A, B and F (LsoA, LsoB, LsoF) that cause damage on plants of the nightshade family (Solanaceae) are known from North and Central America as well as from New Zealand and Australia, but are not established in Europe. The haplotypes C, D and E infect Apiaceae and are established in Europe – like their vectors. Since 2012, Lso is listed in the A1-list of EPPO. The bacterium is listed in Decision (EU) 2019/2072 as a regulated nonquarantine pest on seed potatoes. The vector B. cockerelli is listed as Union quarantine pest.

Due to appropriate climate conditions, it is assumed that Lso (LsoA, LsoB, LsoF) as well as the vector Bactericera cockerelli can establish outdoors in Germany. The establishment in other EU-Member States is possible, too. 

Due to the high damage potential mainly for potatoes, Lso and the vector B. cockerelli pose a significant phytosanitary risk for Germany and other EU Member States. According to current knowledge, Lso infected seeds of Apiaceae bear no or a negligible phytosanitary risk. 

Based on this risk analysis, it is assumed that the vector Bactericera cockerelli and the haplotypes A, B and F of Candidatus Liberibacter solanacearum can establish in Germany and other Member States and may cause severe damage on Solanaceae. Thus, the distribution of all haplotypes of Lso via seed potatoes must be prevented.