pseudomonas avellanae pseudomonas avellanae pseudomonas avellanae is a gram-negative plant pathogenic bacterium. it is the causal agent of bacterial canker of hazelnut (corylus avellana). based on 16s rrna analysis, p. avellanae has been placed in the p. syringae group. this species was once included as a pathovar of pseudomonas syringae, but following dna-dna hybridization, it was instated as a separate species. following ribotypical analysis pseudomonas syringae pv. theae was incorporated into this species. pseudomonas avellanae scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pseudomonadales family: pseudomonadaceae genus: pseudomonas species: p. avellanae binomial name pseudomonas avellanaejanse et al. 1996 type strain cip 105176 dsm 11809 jcm 11937 ncppb 3487 synonyms pseudomonas syringae pv. avellanae dye et al. 1980 pseudomonas syringae pv. theae dye et al. 1980