Definition of leaf spot
: any of various plant diseases characterized by discolored often circular spots on the leaves
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Recent Examples of leaf spot from the Web
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Some diseases cause leaves to rot, but those symptoms tend to be described as leaf spots and blights.
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Control powdery mildew and leaf spots with a fungicide as needed.
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Redtip photinias are disastrous choices due to Entomosporium fungal leaf spot, so don’t let anyone talk you into them.
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Bicarbonate sprays can be very helpful in preventing leaf spot diseases.
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Also keep a fungicide handy to apply as needed — Hydrangeas often suffer from powdery mildew and leaf spots.
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Gray leaf spot has been especially troublesome this year, and many people have reacted by applying nitrogen fertilizer in an attempt to green up their turf.
These example sentences are selected automatically from various online news sources to reflect current usage of the word 'leaf spot.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.
First Known Use of leaf spot
circa 1846
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