Review Epidemiological History of Cypress Canker Disease in Source and Invasion Sites Roberto Danti and Gianni Della Rocca * Institute for Sustainable Plant Protection, National Research Council, Via Madonna del Piano 10, Sesto Fiorentino, Florence 50019, Italy;
[email protected] * Correspondence:
[email protected]; Tel.: +39‐055‐522‐5663 Academic Editor: Matteo Garbelotto Received: 27 February 2017; Accepted: 12 April 2017; Published: 15 April 2017 Abstract: Seiridium cardinale is a fungal pathogen responsible for pandemic cypress canker disease (CCD). The fungus has shown the ability to infect different hosts in many areas throughout the globe, but its spread and impact were favored by conducive environmental conditions. The most severe epidemics were reported in California and the Mediterranean, the former considered the source area of the pathogen from which the Mediterranean infestation have originated. Here we reconstruct the epidemiological history of the disease in California and the Mediterranean. Evolution of the disease in the two contrasting areas was weighed in relation to differences between the two environments in terms of climate, landscape properties, and adopted management practices. In addition, differences emerged among the source and invasive populations in terms of genetic and phenotypic variability, structure, and mode of reproduction allow a few comments to be made about the environmental implications and related quarantine of new introductory events. Keywords: Seiridium cardinale; fungal pathogen; Cupressus; alien species; landscape properties; population genetic; phenotypic traits; disease management; resistance 1. Introduction The introduction of alien species ranks second only to habitat destruction as one of the major threats to native ecosystems [1,2].