Mycosphaerella species occurring on Eucalyptus globulus and Eucalyptus nitens plantations of Tasmania, Australia

摘要

The genus Mycosphaerella Johanson contains many pathogens capable of causing a severe impact onudthe growth of susceptible eucalypt species. The lack of knowledge about which species are present inudTasmania and their potential risk to the plantation industry prompted this study into the Mycosphaerellaudspecies occurring on Eucalyptus globulus and Eucalyptus nitens plantations in Tasmania. Audtotal of 36 plantation and ®ve road verge sites of E. globulus and E. nitens were sampled. Five Mycosphaerellaudspecies and three species from associated anamorph genera were isolated and identi®ed inudTasmania; Mycosphaerella nubilosa, Mycosphaerella cryptica, Mycosphaerella tasmaniensis, Mycosphaerellaudgrandis, Mycosphaerella vespa, Coniothyrium ovatum, Sonderhenia eucalypticola and Sonderheniaudeucalyptorum. The most frequently isolated species with the highest incidence and severityudof infection were M. cryptica and M. nubilosa. These two species appear to have the greatest potentialudto damage juvenile eucalypt plantations in Tasmania. A link between Mycosphaerella vespa andudConiothyrium ovatum is described for the ®rst time.