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copper spot

noun, Plant Pathology
1.
a disease of grasses characterized by coppery or orange spore masses covering the blades, caused by a fungus, Gloeocercospora sorghi.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples for copper spot
  • The adult stage is a small, grey moth with a copper spot on the wing tips.

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