UKTC Archive

Re: Ganoderma resinaceum

Subject: Re: Ganoderma resinaceum
From: Jerry Ross
Date: Jul 28 2021 08:41:29

On 27/07/2021 17:18, David Evans wrote:
<<Anyone have experience of the way that G resinaceum affects Beech? Is it more 
aggressive than on oak?>>

Hi Jerry

My tuppenceworth.

Might a better question be the way G resinaceum affects functional wood of 
any species?
The answer to that is it doesn't.
Basidiomycetes aren't 'aggressive'.
Hi David

Apologies for the appallingly slack use of words. What I should have said is 'is it capable of faster colonization and recycling of dysfunctional tissue....' I just felt that the metaphorical use of the word 'aggressive' was more snappy.

<<Is it less likely to promote buttress growth?>>

Buttress growth development is down to wind loading and vitality, not the 
decay fungus.

So the selective loss of lignin from a tree does not lead to a greater tendency to flex under wind loading, thereby stimulating buttress growth; and 'bottle butt' and the 'Eiffel tower' effect are all imaginary...(?)

<<Is it more likely to cause a beech to fall over?!>>

No more or less than any other decay fungus.

Surely that rather depends on where that decay tends to be within the tree.
But perhaps more to the point, in attempting to make a judgement on risk it's fairly important to have some idea of how apparent decay is likely to be to the observer. If, as seems to be the case with resinaceum it is largely subterranean, in oak anyway (see. e.g. the attached), it seems reasonable to enquire if others have observed root-plate failures in beech affected by the fungus. In this case the tree is exposed to the prevailing winds with a large house within falling distance in the opposite direction; also, two other similar beech trees have fallen over and been shown to be extensively decayed, their appearance not having given rise to concern before going over. I draw no parallels between those and this one - I didn't see them and have no idea what the cause of decay was. However the concern of the house owner - who is keen to keep this tree - is understandable. His (and my) insurers will also have an interest.

However much one might deplore the fact, tree risk assessment always contains an element of assessing the risk to the assessor... (As a matter of interest, do you still actively assess tree professionally? )

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