Phytophthora Root and Collar Rot of Paulownia, a New Disease for Europe

Paulownia species are fast growing trees native to China, which being grown in managed plantings several European countries for the production of wood and biomasses. In 2018, wilting, stunting, leaf yellowing, collapse, as a consequence root crown rot, were observed around 40% 2-year-old planting elongata × P. fortunei Calabria (Southern Italy). Two Phytophthora consistently recovered from roots, basal stem bark, rhizosphere soil symptomatic identified Ph. nicotianae palmivora on basis both morphological characteristics phylogenetic analysis rDNA ITS sequences. Koch’s postulates fulfilled by reproducing symptoms potted paulownia saplings transplanted into infested or stem-inoculated wounding. Both pathogenic caused rot cankers. Even though was only roots naturally infected plants, pathogenicity tests through more virulent. This is first report Europe. Strategies prevent this emerging disease include use healthy nursery choice well-drained soils new plantations, proper irrigation management.