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black chaff

American  

noun

Plant Pathology.

  1. a disease of wheat, characterized by dark, elongated stripes on the chaff, caused by a bacterium, Xanthomonas translucens undulosum.

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An authority on plant pathology, he is credited with discovering the black chaff and yellow stripe rust which attacks Argentine wheat.

From Time Magazine Archive

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.