: a bacterial or fungal rot of plants marked by dark brown discoloration
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Alternaria has leaf spots, while black rot is detected by the yellow triangles on the leaves.—Lauren David, Better Homes & Gardens, 29 Sep. 2024 It is caused by excess soil moisture, characterized by a black rot that spreads from the roots and eventually kills the tree.—oregonlive, 18 Dec. 2022 The second week was cold and rainy and brought black rot (botrytis).—Tom Hyland, Forbes, 11 July 2022 Problems with orchids result from an imbalance of these factors and may lead to various diseases, including black rot, which is rotting roots.—San Diego Union-Tribune, 9 Apr. 2022 The Folle Blanche grapes provide aromatics, the Baco is resistant to black rot and mildew, and Colombard—love it or hate it.—Tom Mullen, Forbes, 13 Mar. 2022 Fungal diseases include black rot, which results in circular, dark depressions on tubers.—The Editors, Good Housekeeping, 21 May 2020
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