HOST PLANTS: Beech Bark Disease can be found on both European and American Beech trees DAMAGE: The fungus may occur in either its sexual or asexual stage. The sexual stage forms tiny, red to salmon-coloured fruiting bodies on the trunk. The asexual stage forms white...
HOST PLANTS: Blue Colorado Spruce is the primary host. Norway Spruce is resistant. Other spruces and pines are infrequently attacked. DAMAGE: Symptoms of needlecast appear between early spring and early summer when needles infected the previous season turn purple or...
HOST: Crabapples and apple vary widely in their resistance to scab. Related (but different) species of the fungus that cause apple scab produce scab on hawthorn, mountain ash and pyracantha. DAMAGE: Apple scab describes the disease as it appears on the disfigured host...
