Abstract
Adenium obesum is an ornamental plant of great economic value in Brazil. In August 2021, an outbreak of a disease that causes basal stem rot, wilt symptoms, and can kill the plant, affected approximately 2000 plants in a commercial nursery in the country. Morphological and phylogenetic analyses identified Neocosmospora ipomoeae and N. parceramosa associated with the symptoms. Neocosmospora ipomoeae is the causal agent of the observed symptoms, and the pathogenicity was confirmed by fulfilling Koch's postulates.
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