In a message dated 05/06/2006 10:29:07 GMT Standard Time,
hazel_catkins@xxxxxxxx.com writes:
Julian - H.anosum also spreads by root contact!
I very much liked Mike's comment on the ease of getting a PhD so I might
observe that the experts would say that wouldn't they? Cos it's one of those
things we all know, and sounds about right.
However in my limited experience of H annosum, (I'm a city based based Arb) I
once found the thing on an old Lawson stump, it was surrounded by more Lawson
Cypress and various other conifers but it had not affected any of the
neighbours... I also had it pointed out to me growing on a brick wall
admittedly with
Spruce all over the place but all the (admittedly quite young) Spruce seemed
in perfect health. While there was Spruce related debris all over the place I
couldn't actually find a stump.
I also found it growing on a lifted Birch stump, physically stuck to the root
under tension. Couldn't find any associated decay though.
With some of these doom-mongers we have to pause a while and note what we
don't see as much as what we do see. We probably have to look at what might
be a
susceptible tree and then look for the opportunist infections. As I see it
these fungi are not agressive predators.....
I'm not disagreeing with the 'fell' conclusion though Collette, just
questioning the epidemiology of the fungus while noting the other comments
about
monocultures and the rest.
Bill.
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