Mature white pine forest has been significantly reduced in
Northeastern Minnesota over the past 120 years. Blister rust, a
usually lethal fungal disease of white pine, was also introduced about
120 years ago, and now poses a major challenge to attempts to
reestablish white pines in the region. A map delineating hazard zones
for blister rust was prepared in 1961 - this report details the
procedure used to update that map using modern GIS techniques. The
new map (above, and page
![[*]](cross_ref_motif.gif)
) is more detailed than the
old, and recognizes that even within areas previously classified as
``high hazard'', there are places where white pine regeneration may be
possible and desirable.
