Blights

Blights [ Botany - Phytopathology ]	Dictionary of botanic terminology - index of names
:

A symptom of disease characterized by a limited and irregular necrotic or discoloured area, as on leaves, flowers, and stems.

As spots grow and coalesce, the symptoms may well be described as a "blight". There are gradations from spots to blights and the better term to use may not always be clear.

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