Worldwide spread and present distribution of fire blight - an update.
Fire blight of pear and apple and numerous other rosaceous host plants, by Erwinia amylovora, is regarded as one of the most destructive diseases of pome fruits. Since the earliest known observation in 1780 in the Hudson Valley of New York, man has physically moved the disease to 3 locations around the world. To date, fire blight has been officially recorded in 31 countries, located mainly in western and eastern Europe and the eastern Mediterranean region. Known countries where fire blight has been reported are presented by continent or region. This paper was presented at the Sixth International Workshop on Fire Blight, held in Athens, Greece, 20-23 Oct. 1992.