Symptoms and signs on white pine

Rusts

White Pine Blister Rust - Symptoms and Signs on White Pine

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Canker on the main stem of white pine

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Pycnia form on the surface of young cankers.

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Aecia on canker of white pine.

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The blister-like aecia have a white peridiurm that ruptures to release the aeciospores.

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Microscopic view of aeciospores. Note warty appearance.