Ecology and management of soilborne plant pathogens / proceedings of Section 5 of the Fourth International Congress of Plant Pathology, University of Melbourne, Melbourne, Australia, 17-24 August 1983 ; edited by C.A. Parker [and others] and proceedings of the First International Workshop on Take-all of Cereals, Victorian Crops Research Institute, Horsham, Victoria, Australia, 10-11 August 1983 ; edited by J.F. Kollmorgen.