Cronartium harknessii

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Cronartium harknessii symptoms (click on image to enlarge it)
Source: Wikimedia Commons

Cronartium harknessii (J.P. Moore) E. Meinecke 1920 - (western gall rust)

This rust fungus infects branches and trunks of pine trees in North America, producing spherical galls on the branches and cankers on the trunks. For example, Pinus contorta is a common host. Outbreaks have been reported from Canada and from parts of the U.S.

Infections result in dieback and tree mortality of seedlings can be common (Egan & Merrill, 1997). The surface of the galls ruptures in spring and orange-coloured spores are released which are airborne and infect new pine shoots.

For details see the respective page in BugwoodWiki.

Vernacular names
• English: western gall rust
• Français: rouille-tumeur autonome

Endocronartium harknessii
Peridermium harknessii