Crop failures of up to 100% have been recorded for parsley in both Queensland and Victoria. Diseases causing major commercial losses in Australia are root rots, which occur in Queensland during warm, wet weather and in Victoria during cool, wet weather. This handbook is a comprehensive guide on identification (including photographs and descriptions of symptoms), source, conditions favouring development, control and management of the different diseases and disorders of parsley. A summary of “best bet” management practices appears at the back of the guide. It is emphasised that chemical information in the book was accurate as of June 2006. It is up to users to ensure chemicals are currently registered or permitted for the intended use.