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angular leaf spot

noun
variants: or 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

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First Known Use of angular leaf spot

1892, in the meaning defined above

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