leaf blight

noun Plant Pathology.
1.
a symptom or phase of many diseases of plants, characterized by necrotic spots or streaks on the leaves, accompanied by seed rot and seedling blight.
2.
any disease so characterized.

Origin:
1840–50

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
It causes stem cankers on trees, and leaf blight or stem dieback on ornamentals.
The maize diseases of concern include common rust, southern rust, northern corn
  leaf blight and southern corn leaf blight.
One unique compound was especially effective against strawberry anthracnose and
  strawberry soft rot and leaf blight.
Genes for resistance to northern corn leaf blight in diverse maize populations.
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