Bibliography: leaves 78-90. / x, 90, [16] leaves, [14] leaves of plates : ill. (some col.) ; 30 cm. / Title page, contents and abstract only. The complete thesis in print form is available from the University Library. / Designed to localize viroids at the histological and subcellular level and to determine with which cellular compartments the different viroids are associated. The majority of the work, in both the viroid and the phytoplasma studies involved the development of different methods and techniques. / Thesis (Ph.D.)--University of Adelaide, Dept. of Plant Science, 1998