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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 Eucalyptus nitens , 3 of Eucalyptus viminalis and 1 of Eucalyptus 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 , Mycosphaerella madeirae , Mycosphaerella marksii , Pseudocercospora pseudoeucalyptorum , Teratosphaeria africana , Teratosphaeria molleriana , Teratosphaeria nubilosa , Teratosphaeria parva , Teratosphaeria readeriellophora , Uwebraunia commune and Uwebraunia 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. T. africana on E. globulus is a new record for Spain. M. 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. |
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