Article: Blister fungus can cause growth on white pine tree.(Home & Garden)(Ask a master gardener)

Q. I have a very large Eastern white pine tree that has some kind of growth on one of the large branches near the base. The tree is at least 60 feet tall. The growth is orange in color, sort of like mold and growing in a scar on one of the branches. Some of the needles on that branch are turning brown.

A. It sounds as if your Eastern White Pine (Pinus strobes) has a fungus called White Pine blister rust (Cronartium ribicola) that may cause the appearance you describe. Another characteristic often noted on trees that are diseased is the appearance of pitch flowing from the swollen areas.

Wind blown spores from gooseberry or currant bushes (Ribes species) ...

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