In 1998, forest vegetation was monitored for ozone injury on permanent plots in two Sierra Nevada national forests in California, at three locations in Mount Rainier National Park in Washington, and at 68 forest health monitoring (FHM) locations throughout Washington, Oregon, and California. This was the first year that extensive...
What is it?
Swiss needle cast of Douglas fir is a foliage disease caused
by the fungus Phaeocryptopus gaeumannii. The disease is
specific to Douglas-fir, affecting no other tree species.
Sudden Oak Death (SOD) is a plant disease caused by the water
mold Phytophthora ramorum. This organism causes disease in
more than 100 species of trees, shrubs, herbs, and ferns.