stem rust

noun

Definition of stem rust 

1 : a rust attacking the stem of a plant especially : a destructive disease especially of wheat caused by a rust fungus (Puccinia graminis) which produces reddish-brown lesions in the uredospore stage and black lesions in the teliospore stage and has any of several plants of the barberry family as an intermediate host

2 : the fungus causing stem rust

First Known Use of stem rust

1899, in the meaning defined at sense 1

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The first known use of stem rust was in 1899

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