Abstract
A hyphomycete with black synnema and appendaged phragmoconidia was collected on Rhododendron brachycarpum showing twig blight symptom in Aomori Prefecture, Japan. The twig blight is macroscopically similar to the disease symptoms caused by Pycnostysanus azaleae. The fungus, however, has determinate synnemata, (1–)3-level verticillately branched conidiophores, and Pestalotia-like conidia. It cannot be accommodated by any existing genus of anamorphic fungi. A new genus Synnemapestaloides is established to accommodate the fungus, which is named S. rhododendri. The pathogenicity of the fungus on Rhododendron leaves and shoots is confirmed by inoculation. Synnemapestaloides twig blight is proposed for the disease of R. brachycarpum caused by the fungus.
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