Rhizosphaera - on Spruce
Blue spruce with Rhizosphaera. Note older infected needles that are brown. The green needles were infected last spring and they will turn brown later in the year or in early spring of next year.
Infected needles fall off during the winter/spring. Green needles seen here are already infected from last spring.
Infected needles with pycnidia. The black pycnidia emerge from the stomata.
Higher magnification showing the pycnidia on the infected needles.