Reddish purple blotches on leaves of broad leaved dock (Rumex obtusifolius) caused by a plant pathogen fungus Ramularia rubella in Sosnovka Park. Saint Petersburg, Russia, May 30, 2019Synonyms: Crocysporium rubellum, Oidium rubellum, Ovularia rubella, Ramularia obovata.
Common name: Ramularia leaf spot.
Russian name: Ramulyariya krasnukha.
Extract from Wikipedia article: Ramularia rubella is a plant pathogen in Ascomycota that infects Rumex species. Infection produces reddish spots on leaves. The red color is caused by the production of rubellin, a photodynamic anthraquinone-derived phytotoxin. R. rubella was originally described from Rumex aquaticus in Germany; it has a wide geographic range on Rumex species. It is being investigated as a biological control agent of Rumex obtusifolius.
Ramularia rubella is a species of fungus that infects plants, specifically roses and other Rosaceae family members. In St. Petersburg, Leningrad Oblast, and north-western Russia, R. rubella has been found to cause leaf spots and blight on rose bushes, particularly in gardens and parks. The fungus thrives in the region's cool and humid climate, with optimal growth temperatures between 15-20°C. It overwinters on infected plant debris and spreads through spores, often disseminated by rain or irrigation water. Infected leaves exhibit characteristic yellowish-brown spots with a white powdery coating, leading to defoliation and reduced plant vigor.
Reddish purple blotches on leaves of broad leaved dock (Rumex obtusifolius) caused by a plant pathogen fungus Ramularia rubella in Sosnovka Park. Saint Petersburg, Russia, May 30, 2019
Leaves of bitter dock (Rumex obtusifolius) with reddish purple blotches caused by fungus Ramularia rubella in Sosnovka Park. Saint Petersburg, Russia, May 30, 2019In Leningrad Oblast and north-western Russia, observations of the fungus Ramularia rubella have been made on broad-leaved dock (Rumex obtusifolius) plants. The fungus causes reddish-purple blotches to appear on the leaves of infected plants. Specifically, in Sosnovka Park, Saint Petersburg, Russia, such symptoms were observed on May 30, 2019. Infected leaves of bitter dock (also Rumex obtusifolius) displayed similar reddish-purple blotches, indicating the presence of Ramularia rubella. These observations suggest that Ramularia rubella is active in this region, infecting broad-leaved dock plants and causing distinctive foliar symptoms. The fungus appears to be present in urban parks, such as Sosnovka Park, highlighting its ability to thrive in various environments. Further study of Ramularia rubella in this region could provide insights into its ecology and impact on plant communities.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
This web page was generated by a special script.