Olga Aguín ^a, María J. Sainz ^b, Aitana Ares ^a,b, Luciano Otero ^a,b, J. Pedro Mansilla ^a

^a Estación Fitopatolóxica de Areeiro, Deputación de Pontevedra, Subida a la Robleda s/n, E-36153 Pontevedra, España
^b Departamento de Producción Vegetal, Universidad de Santiago de Compostela, Campus Universitario, E-27002 Lugo, España

ABSTRACT: The incidence and diversity of fungal species causing Mycosphaerella Diseases (MD) and Teratosphaeria Diseases (TD), and the disease severity, were studied in 190 stands of Eucalyptus globulus, 17 of E. nitens, 3 of E. viminalis and 1 of E. obliqua in NW Spain. Results showed that MD and especially TD were present in practically all E. globulus plantations, in many of them with a high severity, suggesting they might be suffering important wood yield reductions, and extended with low severity to E. nitens, E. viminalis and E. obliqua stands. Eleven species were identified, namely Mycosphaerella aurantia, M. madeirae, M. marksii, Pseudocercospora pseudoeucalyptorum, Teratosphaeria africana, T. molleriana, T. nubilosa, T. parva, T. readeriellophora, Uwebrania commune and U. dekkeri.
All species were found in juvenile foliage, and most also in adult leaves, in E. globulus stands. Less fungal diversity was recorded for E. nitens, E. obliqua and E. viminalis plantations. Teratosphaeria africana on E. globulus is a new record for Spain. Mycosphaerella aurantia on E. globulus, P. pseudoeucalyptorum and U. commune on E. nitens, M. madeirae and T. molleriana on E. obliqua, and T. nubilosa and T. parva on E. viminalis are first records in Europe.
The most frequently isolated species was T. nubilosa, followed by T. parva and T. molleriana. These three fungi were responsible for the highest levels of disease severity.

Keywords: Eucalyptus globulus, ITS; leaf spots; phylogenetic analysis, Teratosphaeria nubilosa.