"Erwinia amylovora" typically makes its entry into its host xylem or cortical parenchyma. It can also enter through stomata, lenticles and hydathodes. It is dispersed by rain and or insects naturally, but this mode of dispersal is very ineffective and can only be effective for local transmission of the pathogen. Aerosols are also suspected in playing a role in its transmission due to the detection of "E. amylovora" in Mediterranean regions. In composition the pathogen is composed of short rods with rounded ends made motile by many peritrichous flagellae. "E. amylovara" is a gram negative bacterium (as stated above).