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angular leaf spot
noun
variants: less commonly
angular spot
Definition of angular leaf spot
: a disease of plants in which the leaf spots have angular and usually sharply limited outlines (as that of cotton caused by the bacterium Xanthomonas malvacearum and that of cucumber caused by the bacterium Pseudomonas lachrymans) — see blackfire
From the M-W Editors
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First Known Use of angular leaf spot
1892
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