UKTC Archive

Chalara dieback of ash

Subject: Chalara dieback of ash
From: Jon Heuch
Date: Jan 31 2019 09:25:26
Bill

 

You have identified a slight dis-connect between the Forestry Commission and
arboriculture work. Beginning in 2012 or early 2013 I tried to point out
that burning material on site or even leaving material on site wasn't an
option for urban tree works. The guidance didn't change. I pointed out that
some of the larger tree surgery companies might be covering quite extensive
areas and with interchange of vehicles it would be possible that at least
some material might be transferred across England quite rapidly. I failed to
have a dialogue with anyone on this subject, not for want of trying.

 

As it happens it quickly became apparent that most stakeholders were
resigned to the disease taking its course. The option of felling to hinder
the spread of disease was dismissed very early on (week 1 or week 2 maybe).
The Countrylandowers (CLA) have been asking for quite some time why there
are any restrictions on ash movement at the moment, as they serve no purpose
in hindering the spread of disease but the restrictions are like a bit of a
calming blanket making us feel something is being done. It is probably the
case that the UK cannot keep such restrictions in place for long..as a
result of European law. But, hey ho, I don't think anyone wants to go there
at the moment.

 

All of the above, Bill, doesn't answer your question other than to say that
the Plant Health (Forestry) Order 2005 2(1) provides a definition of what
they are on about

http://www.legislation.gov.uk/uksi/2005/2517/article/2 

 

The key word for tree appears to be "living" but read on 

 

"tree" means a living tree or shrub, or a living part of a tree or shrub, at
any stage of growth;

and living parts of a tree shall include-

(a) fruit or seed,

(b) branches with or without foliage,

(c) a tree or shrub that has been cut and which retains any foliage,

(d) leaves or foliage,

(e) a tree or shrub in tissue culture, and

(f) bud wood, cuttings or scions;

 

If you are dealing with a Plant Health Order you need to be aware that the
material you have is likely to be infected with the organism or thought to
be infected with it; therefore you need to be aware of 2(7) of the The Plant
Health (England) (Amendment) Order 2012 which reads:

 

(7) In Part B (plant pests known to occur in the European Union which may
not be landed or

spread within England) of Schedule 1(c), for the items under the heading
"Fungi", substitute-

"1 Chalara fraxinea T. Kowalski, including its teleomorph Hymenoscyphus

Pseudoalbidus

 

That is to say, it prevents the spread of the organism not the host..

 

I mean they could make it easy and put it on one side of A4, couldn't they?

 

So the answer to your question Bill (!), I think,  is that if you know the
material is likely to have the organism causing the disease you shouldn't be
"spread"ing it. It is thought that logs and timber won't harbour it so can
still be moved...that's my understanding but it's news to me that there are
PHOs being raised for Chalara. I thought everyone had given up, other than
clearing up dead trees and monitoring the situation..and spending quite a
bit of money on research and genetics.

 

 

Jon Heuch  BSc(For.), PhD, MICFor, MArborA

  

  

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Arboricultural Consultant

Duramen Consulting Ltd

 

 

 

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