Didymella bryoniae
species of fungus
Didymella bryoniae, syn. Mycosphaerella melonis, is an ascomycete fungal plant pathogen that causes gummy stem blight on the family Cucurbitaceae (the family of gourds and melons), which includes cantaloupe, cucumber, muskmelon and watermelon plants. The anamorph/asexual stage for this fungus is called Phoma cucurbitacearum. When this pathogen infects the fruit of cucurbits it is called black rot.
Host symptoms
Gray-green to black circular leaf spots
Angular/target-like water-soaked lesions
Stem lesions/cankers
Vine lesions
Vine Necrosis
Reddish gummy ooze exuding from the lesions/wounds
Wilt
Defoliation
The first symptoms appear as grayish green, circular spots between the veins of the leaf lobes. With age these spots darken to brown and black. Lesions begin to develop on vines at the vine nodes and then elongate into water-soaked streaks, and these streaks are pale brown at first but turn gray with time. The petioles and stems eventually become necrotic and often shrivel. Eventually all infected vines will become necrotic and occasionally the plant dies due to wilting and defoliation. Another common sign following the stem lesions is a red to amber colored ooze.
This brief starts where responsible research should: with the source description of “Didymella bryoniae” as species of fungus. Everything that follows is an evidence route, not borrowed authority.
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This entry incorporates text from “Didymella bryoniae” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.