UK Tree Care - http://www.oak-wood.co.uk/uktc/
The Armillaria problem is an interesting one.
How does the situation where the organism is encouraged deliberately,
(some people eat A. or may wish to have a "wild" garden) by the leaving
of infected stumps compare to the problem of noxious weeds (take your
pick but I'm thinking mostly of things like ragwort etc =
"notifiables".) ?
Would such a scenario change the perception of the problem?
Alan E. Reeves
B.Sc., Cert.Ed.,M.I.Biol.,C.Biol.,F.R.E.S..
Arboriculture Section
Myerscough College
Tel: (044) 01995 640611
Fax: (044) 01995 640842
e-mail: areeves@xxxxxxxxxxx.ac.uk
or :treeline@xxxxxxxxxxx.ac.uk
For the ISA UK/I Treeline Newsletter
Have you visited us at: www.myerscough.ac.uk/arbor/arboricu.htm
or
www.uclan.ac.uk/appbiol/myerscough/ch_scale.htm
Myerscough Collegee, Myerscough Hall, Bilsborrow, Preston. PR3
0RY
----------
From: Scott Cullen[SMTP:dscottcul@xxxxxxxxx.att.net]
Reply To: UK Tree Care
Sent: 11 December 1999 14:46
To: UK Tree Care
Subject: Re: Armillaria
UK Tree Care - http://www.oak-wood.co.uk/uktc/
Concerning liability for Armillaria or other pathogens spreading to
neighbor's property: My understanding is that Armillaria is a soil
inhabiting organism. It colonizes - with variable virulence -
susceptible
host tissue. So even assuming the offending tree stump provides a
large
source of inoculum that might spread and that removal of the stump
might
reduce the available inoculum or its spread, the court would be left
with
the questions of where did the Armillaria (in either garden) come from
in
the first place, would it have colonized the neighbor's plants in any
case,
is the average property owner aware of all those little critters in
the
soil and even if aware can they really do anything to control, or "not
allow" their spread?
I believe there is literature identifying the largest, genetically
identifiable, single organism on record as an Armillaria colony in
Michigan
that covers many acres. So even if the rhizomorphs on the offending
stump
are found to be genetically identical to those on the neighbor's
colonized
plant, who is to say that the offending stump is the sole or only
possible
source?
Concerning "Armillaria" generally: the latest literature I've seen
identifies numerous species with virulence varying from passively
saprophytic to aggressively pathogenic. There is some ability to
distinguish rhizomorphs morphologically and to possibly assign them to
species groups but the only positive identification is genetic which is
available only in highly sophisticated labs.
It would seem fairly conjectural to say "the Armilarria from THAT stump
and
that stump alone colonized this poor plant and caused damages to my
poor,
innocent cleint."
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