1 23 European Journal of Forest Research ISSN 1612-4669 Eur J Forest Res DOI 10.1007/s10342-013-0720-3 Applying cost-distance analysis for forest disease risk mapping: Phytophthora austrocedrae as an example Ludmila La Manna, Alina G. Greslebin & Silvia D. Matteucci