UKTC Archive

Re: Tree stocking and AOD

Subject: Re: Tree stocking and AOD
From: Wayne Tyson
Date: Oct 31 2020 23:04:31
I look forward to future reports. I'm all for zig-zag thinking!

Wayne

On Tue, Oct 27, 2020 at 3:03 AM Brewster, Ian <Ian.Brewster@xxxxxxx.co.uk>
wrote:

Thanks for posting. Have they actually found dead beetles within the mesh?
Thanks for posting. Have they actually found dead beetles within the mesh?



From: uktc-request@xxxxxx.tree-care.info 
<uktc-request@xxxxxx.tree-care.info>
On Behalf Of Jonathan Astill
Sent: 27 October 2020 09:49
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Tree stocking and AOD

Dear all,



On 16th September I posted a photo of an Oak with a fine net stocking
forwarded to me by a colleague asking what it was for. I didn't know. Some
interesting suggestions came back from the forum about what it could be -
mammal protection, contemporary art etc.



I contacted the estate arboriculturist, Tom Crompton by email and kindly
received a reply a few days ago. He was happy for me to share his email
with
you as it may be of interest to anyone looking at control measures for
Acute
Oak Decline (in the north).



All the best,



Jonathan Astill





Tom wrote:





Hi Jonathan



Apologies for my delayed response, as ever work has been hectic especially
considering the current climate.



I'm happy to answer any questions you have regarding the netting that has
been placed around the mature Oak.



Over the last few years we have been noticing significant bleeding to the
stems of a number of declining Oak trees. Further to this we found the
obvious D shaped exit holes of the Agrilus beetle, the suspected vector for
the bacteria.



After sampling the exudation it came back positive for the principal
bacteria of interest in AOD (Acute Oak Decline).



Across the Estate we identified symptomatic trees and wrapped them in
insect
netting to past the point of the highest bleed. The theory being, we could
contain the emerging population of Agrilus to the affected trees. The is a
novel approach and not one I have seen mimicked anywhere else. With the
adult beetle trapped behind the netting they die as they cant reach the
food
source and thus cant spread AOD to further trees. Our aim is to decrease
the
population to an extent where it will not be viable. We also deployed
trapping devices which indicate our initial work has been successful.



The netting forms part of our ongoing strategy in partnerships with
increasing the health and vitality of our Oak population, hence the
mulching
to the root zone. At the moment the netting is restricted to those trees
identified as symptomatic.



The major factor that works in our favour to combat Agrilus beetles and AOD
is that we are right on the northern fringe of Agrilus distribution range.
I
doubt this technique could be mimicked further south in the country due to
the size of the affected tree population.



Hope this helps, if you have any further queries please do not hesitate to
contact me.



Many Thanks



Tom





Hi Jonathan



Some very amusing suggestions. I think one of the best I've had was "does
it
not come in green".



It's an idea we developed on the Estate, and so far it is going well
although it does need some refinement.



I have absolutely no problem with you posting my email reply, further to
this I'm happy to respond to any enquires of anyone who is interested. A
further part of our strategy is education of AOD with wider land holders in
the north as we suspect they may not be aware of its presence and it will
take a combined effort to combat its advance. To this end there will be a
online presentation/q&a about the netting in the new year, the link to
which
I can provide you with when we are ready, also happy for you to post the
link when it's available.



Many thanks



Tom





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NPS
 From: uktc-request@xxxxxx.tree-care.info <
uktc-request@xxxxxx.tree-care.info> On Behalf Of Jonathan Astill
Sent: 27 October 2020 09:49
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Tree stocking and AOD

Dear all,



On 16th September I posted a photo of an Oak with a fine net stocking
forwarded to me by a colleague asking what it was for. I didn't know. Some
interesting suggestions came back from the forum about what it could be -
mammal protection, contemporary art etc.



I contacted the estate arboriculturist, Tom Crompton by email and kindly
received a reply a few days ago. He was happy for me to share his email
with
you as it may be of interest to anyone looking at control measures for
Acute
Oak Decline (in the north).



All the best,



Jonathan Astill





Tom wrote:





Hi Jonathan



Apologies for my delayed response, as ever work has been hectic especially
considering the current climate.



I'm happy to answer any questions you have regarding the netting that has
been placed around the mature Oak.



Over the last few years we have been noticing significant bleeding to the
stems of a number of declining Oak trees. Further to this we found the
obvious D shaped exit holes of the Agrilus beetle, the suspected vector for
the bacteria.



After sampling the exudation it came back positive for the principal
bacteria of interest in AOD (Acute Oak Decline).



Across the Estate we identified symptomatic trees and wrapped them in
insect
netting to past the point of the highest bleed. The theory being, we could
contain the emerging population of Agrilus to the affected trees. The is a
novel approach and not one I have seen mimicked anywhere else. With the
adult beetle trapped behind the netting they die as they cant reach the
food
source and thus cant spread AOD to further trees. Our aim is to decrease
the
population to an extent where it will not be viable. We also deployed
trapping devices which indicate our initial work has been successful.



The netting forms part of our ongoing strategy in partnerships with
increasing the health and vitality of our Oak population, hence the
mulching
to the root zone. At the moment the netting is restricted to those trees
identified as symptomatic.



The major factor that works in our favour to combat Agrilus beetles and AOD
is that we are right on the northern fringe of Agrilus distribution range.
I
doubt this technique could be mimicked further south in the country due to
the size of the affected tree population.



Hope this helps, if you have any further queries please do not hesitate to
contact me.



Many Thanks



Tom





Hi Jonathan



Some very amusing suggestions. I think one of the best I've had was "does
it
not come in green".



It's an idea we developed on the Estate, and so far it is going well
although it does need some refinement.



I have absolutely no problem with you posting my email reply, further to
this I'm happy to respond to any enquires of anyone who is interested. A
further part of our strategy is education of AOD with wider land holders in
the north as we suspect they may not be aware of its presence and it will
take a combined effort to combat its advance. To this end there will be a
online presentation/q&a about the netting in the new year, the link to
which
I can provide you with when we are ready, also happy for you to post the
link when it's available.



Many thanks



Tom





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To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
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https://www.stockholmtreepits.co.uk<https://www.stockholmtreepits.co.uk>



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To unsubscribe send mailto:uktc-unsubscribe@xxxxxx.tree-care.info

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits
https://www.stockholmtreepits.co.uk




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

The UKTC forum is supported by Bosky Trees arboricultural consultancy and
Stockholm Tree Pits
https://www.stockholmtreepits.co.uk