И. В. Тучков During the phytosanitary inspection of a lot of stored potatoes of cv. Zhukovskiy ranniy in the Orel region of Russia, tubers showed signs of lesions in the form of local darkening of the flesh without apparent softening and fungal structures on the surface (coremia). A pure culture of the pathogen was isolated and the morphological characteristics of the conidial sporulation structures in the extracted isolate were described; the average sizes of vegetative mycelium, conidia, conidiophores and coremia were given. Pathogenicity testing of the isolate on leaves and tuber discs showed symptoms in the form of localised chlorosis and necrosis. Subsequent identification of the isolate by PCR and sequencing showed that the isolate analysed was most closely related to the species Cephalotrichum asperulum of the genus Cephalotrichum. The resulting sequence was deposited in GenBank (accession number ON364353). Although these fungi are described in the literature as endophytic, this study emphasises their parasitic effect on the potato plant with certain semeiologies. This is probably the first report of C. asperulum causing local necrosis of potato leaves and tubers during storage in Russia.
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