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Micromycetes from the leaves, petioles, and shoots of Fraxinus excelsior cultivated in a humidified incubator_
| Date of sample collection | Location of sampling and identified micromycetes | ||
|---|---|---|---|
| Aleksandrovsky Park | Babolovsky Park | Palace Park | |
| June 26, 2019 | *Codinaea sp. | *Phomopsis sp. | *Coniothyrium sp. |
| ***Diplodia mutila (Fr.) Mont. | ***Diplodia mutila (Fr.) Mont. | ||
| July 25, 2019 | *Cladosporium herbarum (on galls of Dasineura fraxinea) | *Cladosporium herbarum (on galls of Dasineura fraxinea) | *Cladosporium herbarum (on galls of Dasineura fraxinea) |
| ***Diplodia mutila (Fr.) Mont. | ***Hypoxylon fraxinophilum Pouzar. | ***Coniothyrium sp. | |
| August 27, 2019 | *Alternaria sp. | *Phyllactinia guttata | *Alternaria sp. |
| ***Diplodia sp. | ***Diplodia sp. | ***Diplodia sp. | |
| May 27, 2020 | **Alternaria spp. | **Alternaria sp. | |
The health state of Fraxinus excelsior trees in the parks of Pushkin and Gatchina according to the surveys of 2018–2019_
| Health state categories of trees | Score | Number of trees in each category for each park (%) | ||
|---|---|---|---|---|
| Aleksandrovsky Park | Babolovsky Park | Palace Park | ||
| I (healthy trees) | 1 | 0 (0.0) | 0 (0.0) | 0 (0.0) |
| II (weakened trees) | 2 | 5 (13.5) | 3 (8.6) | 16 (18.2) |
| III (heavily weakened trees) | 3 | 20 (54.1) | 12 (34.3) | 54 (61.4) |
| IV (drying-out trees) | 4 | 10 (27.0) | 15 (42.8) | 15 (17.0) |
| V (trees that had died during the current year) and VI (trees that had died during the previous year) combined | 5 and 6 | 2 (5.4) | 5 (14.3) | 3 (3.4) |
| Total | 37 (100) | 35 (100) | 88 (100) | |
| Weighted score of the tree health category | 3.25 | 3.70 | 3.07 | |