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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Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
These issues include white pine blister rust, dwarf mistletoe and mountain pine beetles.
Blister rust infection and mountain pine beetle infestation rates are low.
Blister rust, insects and drought are all affecting these forests.
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