Tar rot on maple leaves (Rhytisma acerinum) in Sosnovka Park. Saint Petersburg, Russia, October 8, 2016
Pamyatnik Voyennym Letchikam, Sankt-Peterburg, Russia, 194223Synonyms: Melanosorus acerinus, Melasmia acerina, Polystigma acerinum, Rhytisma pseudoplatani, Xyloma acerinum, Xyloma gyrans, Xyloma lacrymans.
Common name: sycamore tarspot.
Russian name: Ritisma klenovaya.
Extract from Wikipedia article: Rhytisma acerinum is a plant pathogen that commonly affects sycamores and maples in late summer and autumn, causing tar spot. Tar spot does not usually have an adverse effect on the trees' long-term health. R. acerinum is an Ascomycete fungus that locally infects the leaves of trees and is a biotrophic parasite. The disease is cosmetic and is therefore usually controlled only with sanitation methods.
Rhytisma acerinum is a fungal species that causes tar spot disease on maple trees, particularly on Acer platanoides. In St. Petersburg, Leningrad Oblast, and north-western Russia, it has been found to be widely distributed, with high infection rates on Norway maple. The fungus produces black, tar-like spots on the leaves, which can lead to premature defoliation. It overwinters on fallen leaves and infects new foliage in the spring, with peak sporulation typically occurring in July-August.
Tar rot on maple leaves (Rhytisma acerinum) in Sosnovka Park. Saint Petersburg, Russia, October 8, 2016Pamyatnik Voyennym Letchikam, Sankt-Peterburg, Russia, 194223
Tar rot fungus on fallen maple leaves, Rhytisma acerinum mushroom, in Sosnovka Park. Saint Petersburg, Russia, October 31, 2016Pamyatnik Voyennym Letchikam, Sankt-Peterburg, Russia, 194223
Tar rot fungus (Rhytisma acerinum) on fallen maple leaves in Sosnovka Park. Saint Petersburg, Russia, March 23, 2017Pamyatnik Voyennym Letchikam, Sankt-Peterburg, Russia, 194223
Tar rot fungus (Rhytisma acerinum) on last year maple leaves in Sosnovka Park. Saint Petersburg, Russia, March 23, 2017Pamyatnik Voyennym Letchikam, Sankt-Peterburg, Russia, 194223
Tar rot fungus (Rhytisma acerinum) on a maple leaf taken from Sosnovka Park. Saint Petersburg, Russia, March 23, 2017pr. Raevskogo, 24, Sankt-Peterburg, Russia, 194064
Sycamore tarspot fungus (Rhytisma acerinum) in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017Primorskoye Shosse, Sankt-Peterburg, Russia, 197755
Sycamore tarspot fungus (Rhytisma acerinum) on fallen maple leaves in a forest along the gulf in area of Lisiy Nos - Morskaya, west from Saint Petersburg. Russia, September 26, 2017Primorskoye Shosse, Sankt-Peterburg, Russia, 197755Observations of Rhytisma acerinum in Leningrad Oblast and north-western Russia reveal its presence on maple leaves in various locations. In Sosnovka Park, the fungus was found on maple leaves on October 8, 2016, and on fallen leaves on October 31, 2016, and March 23, 2017. The fungus was also observed on last year's maple leaves in the same park on March 23, 2017. Additionally, it was found in a forest along the gulf in the area of Lisiy Nos - Morskaya, west of Saint Petersburg, on September 26, 2017, both on fallen maple leaves and on leaves still attached to trees. The fungus appears to be active throughout the year, with observations made in autumn, winter, and spring, indicating its ability to persist on host plants for extended periods.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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