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leaf blotch

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noun Plant Pathology.
  1. a symptom or phase of certain especially fungal diseases of plants, characterized by necrotic discoloration of the leaves.
  2. any disease so characterized.
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Origin of leaf blotch

First recorded in 1905–10
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018