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Meaning of black stem

black' stem'

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease of plants, characterized by blackened stems and defoliation, caused by any of several fungi, as Ascochyta imperfecta or Mycosphaerella lethalis.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.