Meaning of leaf blotch

leaf' blotch"

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a symptom or phase of certain esp. fungal diseases of plants, characterized by necrotic discoloration of the leaves.
  2. any disease so characterized.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.