blister rust

from WordNet (r) 3.0 (2006)
blister rust
    n 1: any of several diseases of pines caused by rust fungi of
         the genus Cronartium and marked by destructive invasion of
         bark and sapwood and producing blisters externally [syn:
         {blister rust}, {white-pine rust}, {white pine blister
         rust}]
    2: fungus causing white pine blister rust and having a complex
       life cycle requiring a plant of genus Ribes as alternate host
       [syn: {blister rust}, {Cronartium ribicola}]
    

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