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blister rust

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blister rust: see rust rust, in botany, name for various parasitic fungi of the order Uredinales and for the diseases of plants that they cause. Rusts form reddish patches of spores on the host plant. About 7,000 species are known.
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blister rust

Any of several diseases of pines, caused by rust fungi (see fungus) of the genus Cronartium. Blister rust affects sapwood (see wood) and inner bark and produces external blisters from which additional spores of the fungus are released and resin oozes, forming characteristic hardened masses on the trunk. It affects pines of all ages and sizes, retarding growth and weakening stems as it spreads along the trunk, sometimes killing the tree; young trees are killed more quickly than older ones. Measures taken to fight blister rust include growing resistant varieties, destroying nearby alternative host plants, observing strict sanitation measures, and spraying with fungicides.
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In some areas of the northern Rocky Mountains of the United States and southern Canada, blister rust has killed from 25 to 50 percent or more of the whitebark pine, with blister rust infection rates as high as 100 percent.
Letters by American Forests
The original black currant farming ban occurred when the United States began importing European white pine seedlings, and white pine blister rust disease came with them.
Governor Pataki Signs Bill into Law to Bring Back the 'Forbidden' ... by Business Wire
The fire combined with the onslaught of blister rust has been an ecological double whammy for biodiversity; the natural recruitment has been predominately lodgepole pine.
Stalwart species: tenacious and rugged, the fire-dependent whitebark ... by Lantz, Gary / American Forests
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