Cronartium ribicola

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Cronartium ribicola fruiting bodies (aecia) (click on image to enlarge it)
Source: Wikimedia Commons

Cronartium ribicola J.C. Fischer ex Raben. 1872 (white pine blister rust)

The fungus causes a serious and lethal stem disease of white pines (species of the subgenus Pinus) in North America. It is also found in Europe and Asia but is not such a devastating disease in these regions. The disease was introduced into northwestern parts of North America in the early 1900s, and white pines have little resistance against this fungus. It has now spread over large parts of western North America. Pines are the aecial host and Ribes species the telial host for the fungus. The planting of ornamental Ribes species is not allowed in some regions in order to reduce the risk for this disease.

Vernacular names
• Deutsch: Strobenrost
• English: white pine blister rust
• Español: roya del grosellero negro
• Français: rouille vésiculeuse du pin blanc
rouille vésiculeuse des pins à 5 aiguilles
rouille à colonnettes des ribes

Infections start at the needles and then spread to the twigs, where pale yellow blisters (aecia) break through the bark and release bright orange aeciospores. These spores infect Ribes species where they produce urediniospores (which re-infect the Ribes host) as well as teliospores and basidiospores. The latter re-infect pine trees.

For details see the respective page in Wikipedia.