PROVISIONAL CLASSIFICATION OF PLANT PATHOGENIC BACTERIA ON THE BASIS OF 
HAZARD TO PLANTS 
Class 1 
Class 2 
Class 3 
Minimal or no hazard to plants. (P2 physical containment + EK1 
host-vector or P2 + EK2). Of minimal or no economic threat to 
crops within the state boundaries because the host plant is not 
present or cultivated in the state; the pathogen is already 
endemic and found ubiquitously in nature, e.g., in the soil; 
climatic conditions do not permit survival of the organism and 
do not favor infection outside the laboratory; or because its 
host range is limited to a few plants that are not cultivated 
in the region. 
Economically important and serious disease causing organisms. 
(P2 physical containment + EK2 host vector) Host present 
within state boundaries and is cultivated or grown naturally in 
large units of land within that state and climatic conditions 
favor infection in the field. Any species that has known vec- 
tors. 
Plant pathogenic bacteria not present in the United States and 
under federal quarantine with absolute denial of introduction 
for whatever reason. 
[Appendix A — 100] 
