The Physical and Chemical Environment of Aerial Plant Surfaces.- Cuticle Permeability Studies.- Nutrients on the Leaf Surface.- Interactions between Plant Surface Micro-Organisms and Their Hosts.- Microbial Attachment to Plant Aerial Surfaces.- Bacterial hrp and Avirulence Genes are Key Determinants in Plant-Pathogen Interactions.- Host Response to Introduction of Antagonistic Yeasts Used for Control of Postharvest Decay.- Coevolution Between Plants and Pathogens of Their Aerial Tissues.- Interactions among Micro-Organisms in Communities on Aerial Plant Surfaces.- Gene Transfer Between Micro-Organisms in the Phyllosphere.- Microbial Interactions Preventing Fungal Growth on Senescent and Necrotic Aerial Plant Surfaces.- Antagonism and Synergism in the Plant Surface Colonisation Strategies of Fungi.- Plant Surface Micro-Organisms, Agricultural Practices, and Food Quality.- Role of Immigration and Other Processes in Determining Epiphytic Bacterial Populations.- Integrated Control of Botrytis Cinerea on Greenhouse Tomatoes.- The Role of Plant Surface Bacteria in the Hygienic and Market Quality of Minimally Processed Vegetables.- Microbiology of Grape Surfaces and its Importance for Wine Quality.- Plant Surface Micro-Organisms as Sources of Compounds Toxic for Humans and Domestic Animals.- Quantification and Modelling of Population Dynamics of Micro-Organisms Associated with Aerial Plant Surfaces.- The Effect of Leaf Age and Position on the Dynamics of Microbial Populations on Aerial Plant Surfaces.- Spatial and Temporal Variations in Size and Phenotypic Structure of Populations of Pseudomonas Syringae on Fruit Trees.- Quantifying Microbial Competition on Leaves.- Predicting Behavior of Phyllosphere Bacteria in the Growth Chamber from Field Studies.- Research Outlook.- Phyllosphere Ecology.