¶ Fraxinus excelsior
¶ Common ash (Gewone es)
Trees
¶ Why this species, in the context of the Amsterdamse Bos
Once 15% of all trees in the Bos. Since 2012 the ash dieback fungus Hymenoscyphus fraxineus has decimated the population: ~500 trees felled January–February 2017, another ~835 in 2018, more than 1,300 lost cumulatively. The graph shows observation activity surging from 1–8 per year (2010–2024) to 62 records in early 2026 — the attention signal of a species being watched as it dies.
¶ Facts from the graph
| Total observations in the Bos | 144 |
| First recorded | 1980-06-09 |
| Last recorded | 2026-05-23 |
| Max rarity tier | 1 — common |
¶ Top sub-locations within the Bos
- Amsterdamse Bos — 45 observations
- Amsterdamse Bos - Bosbaan / Duizendmeterweg — 15 observations
- Amsterdamse Bos - Heuvel / Manege — 11 observations
- Amsterdamse Bos - Geitenboerderij — 9 observations
- Amsterdamse Bos - Kleine Vijver — 9 observations
¶ Explore
- View this species on the Bos map → (all observations, plotted geographically)
- Species page on waarneming.nl
- Bos-filtered observation list on waarneming.nl
- One example observation
Data derived from 136,107 waarneming.nl observations at location 5013 (Amsterdamse Bos), scraped May 2026. Bos-context text: manually composed from the Bosplan 2020–2030, amsterdamsebos.nl, and the existing Het Onzichtbare Zichtbaar dossiers.