black chaff

noun

Plant Pathology.

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

Discover More

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

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