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BackgroundPsyllids are oligophagous phytophagous insects with many specialist willow (   Salix    spp.) feeding species in two genera (   Cacopsylla    and    Bactericera   ). We examine the patterns of distribution and co-occurrence of willow-feeding species at 42 willow sites across Europe forming a transect from Greece (lat. 38.8 °N) to arctic Norway (lat. 70.6 °N). The transect and sites have been described in previous papers.New informationA total of 1245 individual psyllids were examined from 23 species of willow over the transect, representing 17 willow-feeding species (11    Cacopsylla    and 6    Bactericera   ). Numerous species were very widely distributed, with two species,    Bactericera   albiventris    (Foerster, 1848) and    Cacopsylla   pulchra    (Zetterstedt, 1840), occurring from Greece to Finland. Other widespread species (Romania to Finland) were    Cacopsylla   ambigua    (Foerster, 1848) and    Bactericera   curvatinervis    (Foerster, 1848). The mean number of psyllid species per site was 2.4 (1.3    Cacopsylla   , 1.1    Bactericera   ).

Salix transect of Europe: patterns in the distribution of willow-feeding psyllids ( Hemiptera : Psylloidea ) from Greece to arctic Norway