Gall Rusts


Pine-Pine Gall Rust (also called western gall rust) - Peridermium (Endocronartium)harknessii

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Mutiple galls on pine.

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Spores produced on galls look like aeciospores but directly infect pines.

Pine-Oak Gall Rust (also called eastern gall rust) - Cronartium quercuum f.sp. banksiana

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Pine seedling with young gall producing pycnia.

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Gall producing aeciospores.

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Uredinia producing on the lower surface of red oak (the alternate host) leaves.

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Telia on lower surface of red oak leaves.


Fusiform Rust caused by Cronartium quercuum f. sp. fusiforme

Fusiform rust

Fusiforn rust causing a spindle- or fusiform-shaped gall.

Pycnia Fusiform rust

Pycnia, formed soon after infection, produce pycniospores.

Aecia of Fusiform rust

Aecia on the fusiform gall produce aeciospores.

uredinia on red oak leaves

The red oak group of species is the alternate host of Fusiform rust. Uredinia form on the lower leaf surface.

Uredinia of Fusiform rust

Uredinia produce urediniospores on oak leaves.

Red oak alternate host for Fusiform rust

Later in the season, telia form on the leaves.

Telia of Fusiform rust

Telia form out of the old uredinia. The teliospores will produce the basidiospores.