Abstract
Abstract The vegetation of the Nahuel Huapi National Park is characterised by typical Andean patagonic forests with a majority of autochthonous trees like Austrocedrus chilensis, Nothofagus antarctica, N. dombeyi, and N. pumilio. The natural flora is mixed with numerous introduced species. There is a great diversity of parasitic fungi. In this work the powdery mildews which infect both the autochthonous and introduced hosts were studied. Collections were made in summer and autumn in order to obtain the teleomorphic and the anamorphic stages. As a preliminary result fourteen species can be reported: Erysiphe aquilegiae, E. pisi, E. ulmariae var. acaenae, Microsphaera alphitoides, M. baeumleri, M. myoschili, M. oehrensii, M. ovidiae, M. ribicola, Sphaerotheca pannosa, Phyllactinia antarctica, Uncinula magellanica, U. nothofagi, and Oidium mutisiae. Note: Abstract was published in the 6th International Congress of Plant Pathology. July 28–August 6, 1993, Montreal (Québec), Canada.
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