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Ash dieback

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Ash die back the status today and possible answers to the problem.

Ash die back the status today and possible answers to the problem.


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  • 1. Ash Dieback Hymenoscyphus pseudoalbidus Markus Petz Institut für Wald-, Umwelt- und Ressourcenpolitik - BOKU
  • 2. Presentation Outline  Biological background  Health measures  Impact  Society & reactions  Scientific questions
  • 3. Taxonomy 1982 Lambertella albida 2006 Chalara fraxinea 2009 DNA & morphological testing - related to Hymenoscyphus albidus 2010 Hymenoscyphus pseudoalbidus due to molecular genetics Media & Forestry Commission use Chalara ash dieback Biological background
  • 4. EEpidemologyp Fraxinus spp. F. excelsior, F. angustifolia F. mandschurica – low pathology cf Dutch Elm Disease Ophiostoma spp. & Neolithic elm decline Biological background
  • 5. Diagnosis Fungi: Ascomycota Fall http://www.youtube.com/watch?v=8sI7hgFZ-4g&feature=youtu.be Spring http://www.youtube.com/watch?v=UuU8_e0Vw8Q dead tops wilt lesions black leaves Biological background
  • 6. Infected woods Do not remove any plant material (firewood, sticks, leaves or cuttings) from the woodland Before leaving the woodland, clean soil, mud, leaves and other plant material from footwear, clothing, dogs, horses, the wheels and tyres of bicycles, baby buggies, carriages and other vehicles, and remove any leaves which are sticking to your car Before visiting other countryside sites, parks, garden centres, nurseries, thoroughly wash footwear, wheels and tyres in soapy water Follow the instructions on any signs Health measures
  • 7. Ecological implications “Ash dieback poses a major threat to European biodiversity because of the keystone role of F. excelsior in floodplain forest ecosystems in Europe.“ Red List Sweden Butterflies, moss, lichens, land molluscs Pioneer species on grasslands. Ancient ash trees – little studied Carbon sequesterization Impact
  • 8. Economic implications  Further spread possible to USA, Med  Nursery quarantines / More local provenances  Useful tree, furniture, handles, floors  Tree removal – if dangerous  Replant, monitor and screening Impact
  • 9. Ash is culturally significant Society & reactions
  • 10. Citizen science http://ashtag.org/ http://oadb.tsl.ac.uk/ Society & reactions
  • 11. European research Society & reactions 4 Working groups: Pathogen Host Silviculture Dissemination & Knoweldge Gaps
  • 12. What we don‘t know? ?Scientific questions
  • 13. Further info European ash (Fraxinus excelsior) dieback – A conservation biology challenge, Pautasso, M - Biological Conservation 2012 www.fraxback.eu/index.php? option=com_content&view=featured&Itemid=435 www.euforgen.org/about_euforgen/news/can_genetic_diversity_ save_ash_forests.html

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