Defense Responses of Plants to Pathogens. On the Nature and Genetic Basis for Resistance and Tolerance to Fungal Wilt Diseases of Plants. Implications to Population Pressure on Agriculture and Ecosystems. Plant Virus Infection: Another Point of View. The Pathogens and Pests of Chestnuts. Fungal Avirulence Genes and Plant Resistence Genes: Unravelling the Molecular Basis of Gene-For-Gene Interactions. Phytoplasmas: Can Phylogeny Provide the Means to Understand Pathogenicity? Use of Categorical Information and Correspondance Analysis in Plant Disease Epidemiology. Subject Index.