Fact of the Week: July 21, 2015

There is a non-native, invasive fungus called white pine blister rust (Cronartium ribicola), which attacks White Pines, even Sugar Pines (Pinus lambertiana) in the Sierras. Blister rust is incurable for the white pines, however about 3% to 5% of Sugar Pines and Western White Pines (Pinus monticola) are resistant to the fungus.