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Colletotrichum species are the causal agents of potato and tomato diseases, such as black dot and anthracnose. Several new species and species complexes were recently established. Thereby, a reassessment of the genus diversity is required. The study revealed two species, Colletotrichum coccodes and Colletotrichum nigrum, as Russia’s main disease agents of cultivated Solanaceae plants. Black dot and anthracnose in potato were caused exclusively by C. coccodes, whereas the same diseases in tomato, eggplant, and pepper were predominately caused by C. nigrum. However, one isolate of C. coccodes was also identified as an agent of the tomato disease. Five potentially hybrid isolates were discovered. Morphological examination and pathogenicity assessment revealed no significant differences between the two Colletotrichum species. All isolates were sensitive to the fungicides azoxystrobin, difenoconazole, and thiabendazole, which are currently used in agriculture. This is the first report of the occurrence of C. nigrum in Russia.

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inoculated with a drop of sterile water. Control slices and tubers after 10 days of incubation were symptomless. After 7 days mycelium of all tested strains developed on the potato slices, followed after 10 days by the orange sporulation. All three strains could not infect whole intact tubers. Spores from several slices were re-isolated and colonies were identical to the parental strains. To our knowledge, this is the first report of potato tuber disease caused by A. luteoalbus.