blister rust

noun

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

   noun.state

   Synonyms white pine blister rust white-pine rust

   Source: WordNet 3.0

2. fungus causing white pine blister rust and having a complex life cycle requiring a plant of genus Ribes as alternate host

   noun.plant

   Synonyms cronartium ribicola

   Source: WordNet 3.0