Synonyms: Erysiphe quercina, Microsphaera alphitoides, Microsphaera quercina, Oidium alphitoides, Oidium quercinum, Phyllactinia quercus.
Common names: powdery mildew of oak, oak mildew.
Russian name: Erizife dubovaya.
Extract from Wikipedia article: Erysiphe alphitoides is a species of fungus which causes powdery mildew on oak trees.
Erysiphe alphitoides is a powdery mildew fungus that infects oak trees. In St. Petersburg, Leningrad Oblast, and north-western Russia, it has been found to commonly occur on English oak (Quercus robur) and sessile oak (Quercus petraea), with frequent observations in urban parks and forests. The fungus typically appears as white powdery patches on the upper surface of leaves, often causing premature defoliation. It is widely distributed in the region, with a high incidence of infection reported in many areas, particularly during warm and humid summers.
Powdery mildew of oak (Erysiphe alphitoides) on oak seedlings in Dubki (The Oaks) Park in Sestroretsk, near Saint Petersburg. Russia, August 7, 2024
Берёзовая аллея, Курорт, Сестрорецк, Санкт-Петербург, Северо-Западный федеральный округ, 197706, Россия
Oak seedlings discolored by powdery mildew of oak (Erysiphe alphitoides) in Dubki (The Oaks) Park in Sestroretsk, near Saint Petersburg. Russia, August 7, 2024Берёзовая аллея, Курорт, Сестрорецк, Санкт-Петербург, Северо-Западный федеральный округ, 197706, Россия
Whitish covering of oak leaves caused by powdery mildew of oak (Erysiphe alphitoides) in Dubki (The Oaks) Park in Sestroretsk, near Saint Petersburg. Russia, August 7, 2024Берёзовая аллея, Курорт, Сестрорецк, Санкт-Петербург, Северо-Западный федеральный округ, 197706, РоссияObservations in Leningrad Oblast and north-western Russia revealed the presence of Erysiphe alphitoides, a fungus causing powdery mildew on oak seedlings. In Dubki Park, Sestroretsk, near Saint Petersburg, oak seedlings were found to be discolored due to the infection. The leaves of these seedlings had a whitish covering, characteristic of the fungus. This was observed on August 7, 2024, indicating the fungus's active presence during this time. The infected areas included Dubki Park, suggesting that the fungus may be widespread in the region. The powdery mildew infection caused noticeable discoloration and damage to the oak seedlings, highlighting its potential impact on local oak populations. The whitish covering on leaves was a distinctive feature of the infection, making it identifiable in the field.
Russian web-forums Planeta Gribov, V Kontakte, and Griby Sredney Polosy for learning names of local mushrooms.
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