White pine blister rust is the most serious disease of white pine in Maine. Its most commonly observed symptom is the presence of cankered (dead and sunken) areas on tree trunks and branches. Pitch co READ MORE http://www.state.me.us/doc/mfs/dwhitep.htm
White pine blister rust (caused by the fungus Cronartium ribicola J. C. Fisch. ex Rabenh.) was introduced into the United States about 1900 and has since spread throughout the range of white pine. The READ MORE http://na.fs.fed.us/spfo/pubs/howtos/ht_wpblister/toc.htm