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USFS SOD RISK MAP
The USFS developed preliminary “risk/hazard”
map for Sudden Oak Death for the
United States in 2002. Three factors were
used to assign risk: 1) the presence of P. ramorum
host species, host genera, and closely
related genera in forest under- and
over-stories;
2) locations of nurseries receiving P. ramorum
host stock; and 3) the length of annual
moist weather periods. The map divided the
country into high, moderate and low risk
hexagons
(the higher the risk, the smaller the hexagon).
The map below clearly indicates the
two areas of highest risk: the West Coast and
the Central and Southern Appalachian mountains.
—EH
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