This book gives a comprehensive description of methods for the diagnosis of bacterial diseases of plants, especially those of economic importance throughout the world, and the identification of the bacteria that cause them. The methods are those used by the Agricultural Development and Advisory Service of MAFF and by the National Collection of Plant Pathogenic Bacteria, and have been successfully proved over many years. The authors include descriptions of diseases of the causal bacteria, indicating key diagnostic and identification features known to be of value for accurate diagnosis. The methods are intended for use by microbiologists and plant pathologists anywhere in the world