Xylella fastidiosa
Is a non-sporigenous gram-negative bacterium belonging to the family of Xanthonomadaceae. The bacterium is characterized by a high genetic and phenotypic variability. In particular, pathogenic variants of the bacterium have been described, often host-specific, distinguishable in 4 subspecies. Xylella Fastidiosa is an aerobic bacterium, with xylem habitat, that is it multiplies in the xylem building vessels of the host plants, causing even lethal alterations of the infected plants due to the occlusion of the vessels and the consequent irregular lymphatic flow from the roots to the aerial apparatus.