Fungus of creeping thistle rust (Puccinia punctiformis) in Siverskaya, 50 miles south from Saint Petersburg. Russia, July 13, 2017
Leningradskiy per., 3, Siverskiy, Leningradskaya oblast', Russia, 188330Synonyms: Caeoma obtegens, Caeoma suaveolens, Dicaeoma punctiforme, Dicaeoma suaveolens, Hypodermium obtegens, Puccinia hieracii, Puccinia obtegens, Puccinia suaveolens, Trichobasis suaveolens, Uredo obtegens, Uredo punctiformis, Uredo suaveolens.
Common name: thistle rust.
Russian name: Puktsiniya tochechnaya.
Extract from Wikipedia article: Puccinia is a genus of fungi. All species in this genus are obligate plant pathogens and are known as rusts. The genus contains about 4000 species.
Puccinia punctiformis is a species of rust fungus that infects plants in the family Boraginaceae, particularly Echium and Myosotis species. In St. Petersburg, Leningrad Oblast, and north-western Russia, Puccinia punctiformis has been found to be a common pathogen of forget-me-not (Myosotis spp.) and other borages, with reports of its occurrence in various regions, including the Karelian Isthmus and the Murmansk Oblast. The fungus typically produces yellow or orange uredinia on the leaves and stems of infected plants, followed by dark brown telia.
Fungus of creeping thistle rust (Puccinia punctiformis) in Siverskaya, 50 miles south from Saint Petersburg. Russia, July 13, 2017Leningradskiy per., 3, Siverskiy, Leningradskaya oblast', Russia, 188330
Red-brown rust fungus Puccinia punctiformis on the underside of the leaves of creeping thistle (Cirsium arvense) in Siverskaya, 50 miles south from Saint Petersburg. Russia, July 13, 2017Leningradskiy per., 3, Siverskiy, Leningradskaya oblast', Russia, 188330
Creeping thistle rust fungus (Puccinia punctiformis) in Siverskaya, 50 miles south from Saint Petersburg. Russia, July 13, 2017Leningradskiy per., 3, Siverskiy, Leningradskaya oblast', Russia, 188330
Thistle rust fungus (Puccinia punctiformis) taken from area of Udelnaya. Saint Petersburg, Russia, August 11, 2017
Fungus of creeping thistle rust (Puccinia punctiformis) taken from area of Udelnaya. Saint Petersburg, Russia, August 11, 2017
Red-brown rust fungus Puccinia punctiformis on the underside of the leaves of creeping thistle (Cirsium arvense) taken from area of Udelnaya. Saint Petersburg, Russia, August 11, 2017In Leningrad Oblast and north-western Russia, observations of the fungus Puccinia punctiformis were made in several locations. In Siverskaya, 50 miles south of Saint Petersburg, the fungus was found on the underside of creeping thistle leaves on July 13, 2017. The rust fungus appeared as red-brown spots and was also observed on the same host plant in the area of Udelnaya, Saint Petersburg, on August 11, 2017. The fungus was found to infect creeping thistle (Cirsium arvense) in both locations, with similar characteristics and appearances. The observations suggest that Puccinia punctiformis is present in the region and actively infecting its host plant during the summer months. The fungus was consistently found on the underside of leaves, indicating a specific pattern of infection. These findings provide insight into the distribution and behavior of Puccinia punctiformis in north-western Russia.
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