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Published online by Cambridge University Press: 01 September 1998
Mycosphaerella vespa sp nov. is described from diseased leaves of Eucalyptus from south-eastern Australia. It is associated with small, circular to irregular lesions that have red-brown margins and amphigenous pseudothecia. These characters, in combination with ascospore morphology and germination, distinguish M. vespa from previously described species of Mycosphaerella on eucalypt leaves. Lesions associated with this pathogen were often found to be harbouring wasps and this observation is discussed.