Blister-rust

blister rust

noun Plant Pathology.
a disease, especially of white pines, characterized by cankers and in the spring by blisters on the stems, caused by a rust fungus of the genus Cronartium.

Origin:
1915–20

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World English Dictionary
blister rust
 
n
a disease of certain pines caused by rust fungi of the genus Cronartium, causing swellings on the bark from which orange masses of spores are released

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