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Everything posted by Willowboy

  1. >>Try to take rubbing branches as part of the thinning where possible.<< Definate nono according to Duncan Slater. Branches that have grown up with external support from other branches are likely to have weak unions.
  2. Interesting...thanks for sharing. The main takehome point for me is that between 15 - 58% of trees tested by PCR had decay fungi present (a smaller number than I would have thought), but if it is latent in the sapwood or effectively compartmentalised it doesn't pose an immediate issue for the tree. Fruiting bodies are an indication that a particular decay fungi is present and active in the tree and probably has been for a while, and obvs should be seriously appraised, but their presence/absence is only one strand of VTA, which looks at the tree, and its' responses to a number of different factors, as a whole.
  3. Nonsense! You can't anthropomorphise the relationship between trees and fungi, and can't reduce it to 'good' guys and 'bad' guys... Trees and decay fungi have evolved together over millennia, and while it is disappointing to lose individual valuable trees to the likes of Ganoderma (and as a TO I've lost a few on my patch) there's no point getting hysterical about it. Incidentally, the '87 hurricane was a lightbulb moment for arboriculture, when it was realised that hollowed trees were more resilient to windblow than non-decayed stems.
  4. Eh??? Why would anyone want to make Ganoderma extinct? Have we learned nothing regarding the complex relationship between trees and wood decaying fungi in the last 20 years?
  5. Anybody got any ideas on how long it will take for a functional mycorrhizal community to develop naturally on a new tree planting site on what was formerly a landfill, rough grazing and amenity grassland. Are we talking years or decades, and what can be practically be done to speed up the process?
  6. Yes! Looks like it. Planted by Aberdeen Council on the edge of a common 25 years ago, small group. Thanks.
  7. Can anyone help with this alder id? I'm familiar with black, grey, red, green, italian and sitka but this doesn't fit the bill with any of them. Closest to Italian in jizz but leaves are massive (25x11cm), almost hairless and uneven at base rather than cordate. Thanks
  8. Sounds like what I was thinking. Thanks for that, Paul.
  9. Hi all, Some basic dumbarse questions I hope you can help me with: Am I right in believing that the only recourse a LA can have to stop treework being carried in a Conservation Area is to put on a TPO before the end of 6 weeks after receiving a notice of intent describing the work? Or do they have other powers to stop work? Also, if a LA requests clarification or further info, does the 6 weeks period start again?
  10. Went to Duncan Slater's Fork workshop in Edinburgh a couple of days ago. His research shows that 93% of unions with included bark are associated with strain being removed from the branch by mechanical bracing further up the branch, such as by crossing or rubbing branches, at some point in time. So trees with a naturally dense and tangled crown, such as whitebeams or hornbeams for example, or fastigiate cultivars of many sp. have a genetic predisposition to 'bad crotches'.
  11. Damn, only just caught up with thread... Could have astounded aabody by saying Toona sinensis (but that would have been based on your earlier reference to surveying Glasgow Botanics rather than any sublime id skills!!).
  12. I'd go with Nothofagus obliqua on this one based on form (fairly distinctive), bark (grey with horizontal plates) and most importantly leaf (veins reach the margin between the points as opposed to at the points in Zelkova.)
  13. Do the beetles wait for height or is it maturity? Dredging my memory of lectures 20 years ago, I think the beetles find trees of a suitable height, where they feed in the leaf axils on twigs in the crown, infecting the phloem with the fungal spores picked up from the dead wood in which they hatched. The infection then progresses up the branches and eventually into the trunk aided by the trees own nutrient transportation system, leaving dead branches and a 'stag-headed' look to the crown. Debarking any felled infected timber will deprive beetles of egg-laying sites.
  14. Type of nusery stock (ie bare-root or plugs), stock size and planting method (if specified) also a consideration....
  15. Although, as various folk commented, DED aint going away, you can do your bit for hygeine by debarking any timber left lying about or sold.


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