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Meaning of net blotch

net' blotch"

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease of barley, characterized by a brown, netlike discoloration of the leaves, caused by fungi of the genus Helminthosporium.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.