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Phomopsis stem canker is economically important sunflower disease that caused by multiple  Diaporthe  species. Recent investigations resulted in the resolution that there are at least 13  Diaporthe  species that can infect sunflower. A comprehensive analysis of the biodiversity and geographic distribution of  Diaporthe  species in Russia, particularly those that infect sunflower, has not been undertaken. For this study, 16  Diaporthe  isolates were obtained from samples of stem canker and visually healthy seeds of  Helianthus annuus  from northwestern, central European, southern European Russia, North Caucasus, and the Urals in 2016–2019. The aim of this study was to identify these  Diaporthe  isolates based on morphology and sequence analyses of the nuclear ribosomal internal transcribed spacer (ITS) region, partial calmodulin ( cal ), DNA-lyase ( apn2 ), histone H3 ( his3 ), translation elongation factor-1α gene ( tef1 ), and ß-tubulin ( tub2 ) genes. The phylogenetic reconstruction revealed well-supported monophyletic clades corresponding to six  Diaporthe  species:  D. eres, D. gulyae, D. helianthi , and  D. phaseolorum . Two new species were described:  Diaporthe monetii  sp. nov. and  Diaporthe vangoghii  sp. nov. The isolates of  D. gulyae  and  D. phaseolorum  collected represent the first records of these species in Russia.

Diaporthe species infecting sunflower ( Helianthus annuus ) in Russia, with the description of two new species