UKTC Archive

RE: Ganoderma applanatum/australe on n.maple - implications

Subject: RE: Ganoderma applanatum/australe on n.maple - implications
From: David Evans
Date: Dec 22 2011 09:48:34
<<To avoid misunderstanding because of my way of expressing myself in the 
English language, of which I'm not a native speaker>>

Hi Gerrit

Your English is impressive.  The only Dutch I ever learned was "Spreekt u 
Engels?" when I went over to present a paper at a conference in Maastricht 
years ago.  The reply I got from the every Dutch person whenever I asked this 
was "Of course I do", accompanied with a slightly puzzled look.  Eventually, 
I gave up my three words of Dutch and rather than assume everyone spoke 
English I would still politely ask whether they did but in English.  That was 
until I was catching the train back to Amsterdam when I asked a harried 
station attendant about platform changes because a train had broken down, and 
opened with whether he spoke English.  He curtly replied in English "Do you 
speak Dutch?" To which I was able to reply "Spreekt u Engels?"  Anyhow, 
rambling lost in translation tales aside, I am mindful there is a possibility 
of some misunderstanding when talking at about technical subjects where 
definitions are important and will bear it in mind.

<<Although there is quite a difference in your definition of biotrophic and 
necrotrophic parasites and the definition of both terms on the continent, as 
is included in all Dutch, German and Scandinavian literature I refer to, I 
consider your definition to be the more precise.>>

Thanks for the clarification you to David Lonsdale about the different 
definitions on continental Europe.  So, in the English speaking world you're 
not claiming G. adspersum/australe is a biotrophic parasite with pathology 
definitions as we understand them.  Can you please let us know what the 
continental definition of a biotrophic parasite is?

<<Not on the internet and not in English, only in private communications 
among colleagues, as my research is still in progress and probably will be 
published next year. And no, this far all research on G. australe was done in 
vitro (Schwartze), i.e. not in situ and not on living trees.>>

Please let us know when you publish in English.  I'm familiar with Francis 
Schwarze's research into G. adspersum/australe and raised the in vitro 'v' in 
vivo limitations of it with Tony when he first appeared on here speaking in 
tongues and prophetically warning us we could all end up in court if we 
didn't believe him and act on what 'a beast G. australe' was.  Given the 
stringent in vitro conditions that Francis used - sterilised 1cm blocks of 
wood sealed in paraffin and incubated with fungus and no competition - though 
interesting, I saw nothing from the research, or in the field, that would 
lead me to believe G. adspersum/australe was a biotrophic parasite.

When I was looking Ganodermas back in the mid 1990s it was using mycelium to 
identify them in the laboratory.  I appreciate distinguishing between G. 
adspersum/australe and G. applanatum/lipsiense is fraught with difficulty in 
the field with macroscopic features.  IIRC one of the macroscopic features 
that might help distinguish between them was that G. adspersum/australe 
tended to have much thicker flesh to pore ratios and the flesh was often a 
darker chocolate brown, but this would be caveated and may have been down to 
the locality of Durham, where I was looking at this.  I don't know whether 
it's the same in your patch, or whether other UKTCers have any observations 
about this feature.

I've not been overly concerned about distinguishing between the 
identification of the two Ganodermas because I've not seen anything 
published, or in the field, that has persuaded me that there's a significant 
difference between how they affect the stability of a tree.  So I look 
forward to seeing your research being published.  Apart from the Ganodermas, 
this is the bit (below) that particularly interests me because it's contrary 
to my present understanding about the substantial constraints that functional 
living xylem has on colonisation by such decay fungi.

<<3) Has your research established that G. adspersum/australe invades and 
colonises functional living xylem?
3) Yes, just as all in situ research on living trees shows that all 
Ganoderma's and all other necrotrophic and biotrophic parasites do.>>

I'll start another thread after Christmas on this, but are you also the 
source of 'panic fruiting' that Tony also brought to the UKTC?

Cheers

Acer ventura




-- 
The UK Tree Care mailing list
To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC is supported by The Arbor Centre
http://www.arborcentre.co.uk/