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David Humphries

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Everything posted by David Humphries

  1. David Humphries
    @mycoappman .
  2. David Humphries
    Most probably applanatum or australe then. Did you think about taking a slice of the flesh and tubes? .
  3. David Humphries
    Excellent ! .
  4. David Humphries
    Was it hard or squidgy? .
  5. David Humphries
    Hard to say anything concrete based on that image Paul, but one of the main symptoms to aid Identification of Ceratocystis platani (in the field)is retained dead leaves, which your one doesn't seem to show. Depends on how long its been standing dead I guess. Thanks for posting it in the thread .
  6. David Humphries
    we didn't have it at hand, as we were on a different job with this one next to it. I suspect we'll go back up to re run the resistograph to compare. .
  7. David Humphries
    Turns out that it was a Ganoderma bracket. Fairly unusual (Ime) at 20 feet up on a live oak stem. Possibly G. applanatum' date=' but not microscopically confirmed. . .
  8. David Humphries
    Case of misidentification from me on this one. Thought that the white forming bulby fruitbody (@ 2 minutes) in this video from three years ago was 'possibly' Fomes fomentarius [ame] [/ame] .
  9. David Humphries
    Could you post some more images of them on to your thread when you return to the site? Was your contact to the FC via email to the tree alert app? Dissapointing to hear that you didn't hear back. .
  10. David Humphries
    Still buzzing about .
  11. David Humphries
    Yep, that's the one. Good video link .
  12. David Humphries
    The samples take between 5 and 10 days to incubate Gary. There will be a number of articles and write ups across magazines and websites (including the AA mag) .
  13. David Humphries
    Ta, part of the reason of the workshop I attended was to disseminate the Information as widely as possible. 12 of us went across to Italy last weekend and spent a packed three days out in the field, in seminar and in the lab so that we can use the skills out during inspection (specifically for Ceratocystis) but also to share the knowledge with Arborists potentially working on infected trees both here in the uk and across on the continent, also Tree Officers/Tree Managers. . .
  14. David Humphries
    Confirmation of the disease can be carried out by sampling core material. Incubation then identification of the perithecia (fruiting body), conidia and hyphae under microscope. .
  15. David Humphries
    Symptoms of other similar decline in Planes can be due to poisoning from disgruntled property owners (as in below) These trees were drilled and poisoned. Also road salt can lead to similar decline and death. .
  16. David Humphries
    The pathogen spreads rapidly through the tree so it's important to identify it via inspection as early as possible and then to have the tree(s) removed. Symptoms to look for are; Desiccation of leaves (which remain in the tree) Partial canopy death associated with the vascular dysfunction below. Transitional trunk death shown by dead bark adjacent to live bark with epicormic growth Staining under the bark. .
  17. David Humphries
    Pruning is the most common form of transmitting the disease within urban tree populations. Poor (or lack of) biosecurity by Arborists working on canker stain trees, enables the pathogen to be spread by infected sawdust, wood and tools. In Italy there are strict controls in place for those working on affected trees. I recently witnessed this control during a dismantling operation of an infected tree in Padua, northern Italy. Sheeting is placed under the tree to contain as much sawdust and woody debris as possible and the tree was rigged down to control the risk of damage and infection to neighbouring trees. The arisings are contained and transported off site then burnt to destroy the infected material. The tools are cleaned and isolated during movement between sites. This leads to an increased cost in time and expense but is considered to be the best way to manage the spread of the disease .
  18. David Humphries
    Ceratocystis platani is a wound parasite that requires an open wound for infection either above ground on the trunk/major branches or below ground via root grafting. It has no known natural vector. The above image shows bark having being scraped to show the transition between dead and live parts of the tree and the associated canker staining. .
  19. David Humphries
    A fungal pathogen that causes a canker stain of plane trees, which leads to rapid decline and death. Introduced to the south of France from the USA in the 1940's Now found in Europe across France, Italy, Switzerland, Greece and Albania. Currently considered not to be in the UK, and is the subject of an ongoing survey of Plane populations by the Forestry Commission and the London Tree Officers Association. .
  20. David Humphries
    Short promo video about Matt's book and a series of accompanying interviews about the site....... [ame] [/ame] .
  21. David Humphries
    Amatuer There's an app for that, you know .
  22. David Humphries
    International Tree Failure Database Administrated via University of California Not 100 % sure it's live anymore. http://ucanr.edu/sites/treefail/files/4358.pdf .
  23. David Humphries
    Did you catch my most favourite fungal find from couple of days back ? http://arbtalk.co.uk/forum/fungi-pictures/10467-travelling-fungalburys-4.html#post1479962 .
  24. David Humphries
    Veritable fungal garden .
  25. David Humphries
    Yep, hybrid plane, with stronger occidentalis genes. That's what Ceratocystis platani appears to prefer. P. orientalis is less susceptible...........but that's for another thread. .

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