Recognition of Erwinia amylovora hosts
The French Plant Protection Service, in cooperation with INRA and the Horticultural College in Angers, have produced (in French) a "Guide to the field recognition of the main host species of fireblight". Enforcement of regulations to limit the spread of Erwinia amylovora (EPPO A2 quarantine organism) depends on being able to distinguish host plants, and this publication would be extremely useful in all EPPO countries, whether they are seeking to prevent the spread of fireblight on their territories, or needing to certify material for export.
Sources
French Plant Protection Service (1992-06)