Abstract
Occurrence of gummy stem blight in watermelon in the state of Tocantins, caused by Didymella bryoniae Canker symptoms at the base of stems and brown exudates were observed in watermelon (Citrullus lanatus) plants collected in Formoso Project, Tocantins State. The teleomorphic and anamorphic stages (Didymella bryoniae and Ascochyta cucumis, repectively) were observed. Detailed descriptions, morphometrics and optical and electronic illustrations of both stages are done here for the first time in Brazil. The pathogenicity of several Tocantins isolates was confirmed by artificial
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