Symptoms and signs on white pine
White Pine Blister Rust - Symptoms and Signs on White Pine
Canker on the main stem of white pine
Pycnia form on the surface of young cankers.
Aecia on canker of white pine.
The blister-like aecia have a white peridiurm that ruptures to release the aeciospores.
Microscopic view of aeciospores. Note warty appearance.