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White Pine Blister Rust

White Pine Blister Rust

The photomicrograph above illustrates a stained thin section of pine tree stem infected with White Pine Blister Rust, a serious disease of pine trees caused by the fungus Cronartium ribicola. This fungus also is a disease of the Ribes genus (currant and gooseberry bushes), which serves as an alternate host for the fungus.

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