School of Agriculture, Food and Ecosystem Sciences - Theses
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ItemA study of the species of Mycosphaerella on eucalypts in Australia and the impact of Mycosphaerella leaf diseases on Eucalyptus globulus Labill( 2000)In this study, the taxonomy of the species of Mycosphaerella that cause leaf diseases of eucalypts was reviewed, the effect of these diseases on E. globulus in plantations was quantified, and the use of silvicultural methods, tree selection and resistance breeding to reduce the impact of Mycosphaerella leaf diseases in commercial plantations was investigated. Over 30 species of Mycosphaerella cause leaf spots and defoliation on a wide range of eucalypt species (Eucalyptus and Corymbia), but the taxonomy of some of these is incomplete, and there is confusion in species identity between morphologically similar species. Therefore, herbarium specimens, fresh collections and previous records of Mycosphaerella species from eucalypts in Australia and elsewhere were examined. Widespread surveys of Mycosphaerella species of eucalypts in plantations and native forests were conducted in Western Australia, South Australia, Victoria, Tasmania and New South Wales. A new species of Mycosphaerella (M. vespa) was described from plantations, a previously described species (M. gregaria) was revised following further observations and investigations, further host and location records were reported, and the first record of M. suberosa outside Brazil (its place of description) was made. A detailed list of the species of Mycosphaerella in Australia was compiled, with descriptions, photographs, and illustrations of each species. A table of important taxonomic characteristics of Mycosphaerella species on eucalypts was compiled, and a taxonomic key developed to aid in identification of the species in Australia. (Part of the summary only)