Underside of a leaf with coltsfoot rust gall fungus, Puccinia poarum, in Sosnovka Park. St.Petersburg, Russia

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Petiayarvi - Saint Petersburg, Russia, May 26 - 27, 2019

Album 2513: Petiayarvi - Saint Petersburg, Russia, May 26 - 27, 2019

The image depicts a green leaf lying on dark soil or dirt. A stem runs through the center of the leaf and its underside is visible. The leaf has small white circular spots with yellow centers that are scattered across it in random areas.

Rust galls, caused by the fungus Puccinia poarum, appear as small, round, whitish masses on the lower surface of leaves. The rust causes damage to plants by reducing photosynthesis and weakening their immune systems.

The leaf appears to be a coltsfoot (Tussac farfara) leaf, which is infected with rust galls caused by Puccinia poarum.

The image suggests that it was taken in the spring or early summer when the fungus is most active. The presence of rust gall on the leaf indicates that the plant is susceptible to infection and may be experiencing stress due to environmental factors such as temperature fluctuations, humidity levels, or nutrient deficiencies. – AI vision

🇷🇺 Описание по-русски / Russian Description

Нижняя часть листа с росой на черемехе, Puccinia poarum, в парке Сосновка. Санкт-Петербург, Россия, 27 мая 2019 года. На изображении изображен зеленый лист, лежащий на темной почве или грязи. Центр листа проходит стебель, и его нижняя часть видна. На нем есть мелкие белые круглые пятна с желтыми центрами, разбросанные на нем в случайных областях. Росовые шишки, вызванные грибком Puccinia poarum, появляются как маленькие, круглые, белесые массы на нижней поверхности листьев. Роса наносит ущерб растениям путем снижения фотосинтеза и ослабления их иммунитета. Лист кажется листом черемехи (Tussac farfara), зараженным росовыми шишками, вызванными Puccinia poarum. На изображении видно, что оно было сделано весной или ранним летом, когда грибок наиболее активен. Присутствие росовых шишек на листе указывает на то, что растение подвержено заражению и может испытывать стресс из-за факторов окружающей среды, таких как колебания температуры, влажность или дефицит питательных веществ. – Russian translation

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