Treecreeper1961

Matt, According to Forest Mensuration in general conifer stacks require a con\/ersion factor of 0.7 to allow for air and hard wood between 0.55 and 0.65 depending on the form of the timber. To con\/ert \/oume to weight, if felled recently and for timber with a mean mid diameter of 20cm the following is recommended: Oak 0.94 m3 to 1tonne Ash 1.28 m3 to 1 tonne Sycamore 1.2 m3 to 1 tonne

:boxing:awkward

There is a reasonable amount of shelter at the level of the tree's current crown height but something has definitely 'happened' to the top of this tree at some point in it's life. Judging by the over extended limbs it would probably have suffered a bit of lower level wind damage if it was exposed. A real candidate for some carefully planned retrenchment pruning I reckon. Perhaps I should have paid more attention to the texture of bark on old oaks with stress issues! These patches of smooth bark seem pretty extreme to me.

The things that had me questioning what seems to be otherwise obvious bark symptoms of high local tension is one, it appears in areas that perhaps you may not expect to be under tension (such as on the underside of the lower branch in shot three and high on the main stem), and two, the texture of the bark was kind of soft, not taught and shiny as I usually seem to see. I suppose the tension on the lower branch must be from torsional loading?

I have sen an oak tree recently with some patches of smooth unusual bark which I have not seen very often. I have definitely seen this before but never really given it a great deal of thought. I have a feeling it may be partly due to mechanical stresses in places but it seems there may be more of a physiological dysfunction type thing going on too. The out side of the bark had a texture that made me think it may have been dead but the cambium/bark cambium was alive. If any one can shed some light on it that would be great. Sorry for the photos not being the best.

This is another monumental bio security disaster of nightmare proportions. What is it about the human race that makes us almost guaranteed to make the same mistakes over again. If indeed the cat is out of the bag then any biosecurity measures we can, may, must or choose to undertake are probably simply a matter of personal pride and conscience. Take a look at what has happened with P.ramorum. Once the pathogen is released into the 'natural environment' it is only nature that can determine the ultimate extent of what will ensue. It seems to me that the strategy of both c. fraxinea and p. ramorum is efficient and similar in ways. There is not enough money to carry out the best practice bio security and the reality is there is no real point. Why attempt to contain such pathogens ( air born, water born, spread by birds and anything that moves) with such feeble measures as cleaning boots and tyres? ( I do clean my boots and sanitize with propellor because I cannot bear the guilt of personal responsibility and I don't know if I am just playing devils advocate.) The British Isles has been blessed with a natural barrier against the ravages of many diseases but this isolation may also prove to be a fatal weakness. Please can we use our location to our advantage and come to our senses. We could so easily, comparatively, stop these issues before they even come ashore. Local provenance. Of course there is more than one flaw to this theory. Creating a weak gene pool and not to mention the practice of collecting local seed to be propagated in Dutch nurseries. Serfs never should have left the parish. I hate sounding like a left wing fascist. I love Ash trees, they are my favourites.

I'll throw my hat in with Alder Buckthorn, Rhamnus frangula.

Not wanting to de-rail but did anyone notice the very early loss of leaves, mostly on lower branches, on sycamores this summer? Especially on river banks. Any ideas on the cause?

Yes and it has never carried any COSHH warning labels. I have read the product data sheet many times and it basically states there are no toxic effects 'short term'. However, there is no information about long term effects. It is worrying for me too. My old boss even drank some in front of me to demonstrate his unwavering belief that it was safe! What a role model. I have always been suspicious of herbicides, including G., it wasn't long ago that, tongue in cheek, I compared it to asbestos, the what was wonder material that concealed such menace. Lets hope all those pesticide record sheets have been kept. We may be needing some legal advice if this is correct. One glimmer of hope is that Round Up Biactive is not considered as bad. Watch this space??

That sets the scene of the wildwood nicely. There must have been open grazed land for oaks to propagate.

Yes, thanks David. It takes quite a lot of practice with the hammer to get a feel for it. Can you pick out differences between types of decay? I was wondering whether roots that are decayed on the underside give much of a clue. Depends on the extent I guess.

:laugh1:Did you read the manual for the sounding hammer? "Must wear ear defenders when operating this equipment!" Fascinating stuff. Meripilus often rots the underneath of roots, I'm sure I remember you saying.( Sorry, missed that on first read,must be tired.) How does that effect the resonance of the sounding?

Agree, oak is a pioneer species, light demanding, cannot realy regenerate under it,s own shade. Strange one because it is also a climax species but that is lagely due to land management I would guess.