UKTC Archive

RE: Verticillium wilt control in Norway maple

Subject: RE: Verticillium wilt control in Norway maple
From: Rupert Baker
Date: Jan 16 2021 12:09:54
______________________________________________________________________
FLAC. The Seminar, 2021. 2 days, 8 lectures, 11 hours world-class CPD
-Philosophy of tree risk assessment. -Practical hazard identification
-Trees & decay fungi: a new approach. -THREATS
-Forensic entomology. -Decision-making & tree work for risk control
-Tree morphology & retrenchment pruning. -RAVEN
13-14 May, Forest of Arden Marriott; 20-21 May, Dundee Uni Botanics
Please email enquiries@xxxxx.uk.com to register interest
______________________________________________________________________

Hi Phil, thanks for the extra info; given what you've told me, I'm at a loss, 
and unwilling to speculate on what might be done.  Can I suggest you or the 
LA talk to the pathology section of Forest Research - they may have some info 
or advice;  https://www.forestresearch.gov.uk/   
The only - general - advice I'd give is to encourage growth n the 
trees/reduce any environmental stresses - esp by weed control around their 
bases, and irrigation in dry weather - and if on low-nutrient, crap 
substrates, consider fertilisation, esp using organic or other fertilisers 
with a wide range of trace elements; you could also think about soil 
amelioration using decompaction/injection of mycorrhizzae/ fertilisers - 
though the research on these is at best inconclusive.  It is a soil-borne 
pathogen, so I'd also do a search of the literature to see if there are any 
antagonistic fungi (along the lines of Trichoderma) that might help - dohh! 
I've ended up giving advice anyway - best of luck 

Rupert

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info On Behalf Of Phil Dye
Sent: 16 January 2021 10:27
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: Verticillium wilt control in Norway maple

______________________________________________________________________
FLAC. The Seminar, 2021. 2 days, 8 lectures, 11 hours world-class CPD 
-Philosophy of tree risk assessment. -Practical hazard identification -Trees 
& decay fungi: a new approach. -THREATS -Forensic entomology. 
-Decision-making & tree work for risk control -Tree morphology & retrenchment 
pruning. -RAVEN
13-14 May, Forest of Arden Marriott; 20-21 May, Dundee Uni Botanics Please 
email enquiries@xxxxx.uk.com to register interest 
______________________________________________________________________

Hi Rupert,
The trees are all semi to early mature. Some are riddled with it, others 
showing just onset of the disease. As it's often the central branches that 
seem affected, pruning them out is not an option either aesthetically or 
structurally. They're all street trees so they need to be low risk AND look 
nice! Best regards Phil

Sent from Yahoo Mail on Android 
 
  On Wed, 13 Jan 2021 at 13:01, Rupert Baker<rupert_baker@xxxxxxxx.co.uk> 
wrote:   
______________________________________________________________________
FLAC. The Seminar, 2021. 2 days, 8 lectures, 11 hours world-class CPD 
-Philosophy of tree risk assessment. -Practical hazard identification -Trees 
& decay fungi: a new approach. -THREATS -Forensic entomology. 
-Decision-making & tree work for risk control -Tree morphology & retrenchment 
pruning. -RAVEN
13-14 May, Forest of Arden Marriott; 20-21 May, Dundee Uni Botanics Please 
email enquiries@xxxxx.uk.com to register interest 
______________________________________________________________________

Hi Phil, how big are the trees;  if ~recently planted nursery stock, that is 
where the disease came from - the nursery -; if older, I don’t know - but it 
can show several years after planting. I had trees grow out of it;  and the 
risk with pruning is spreading the pathogen unless your sanitary procedures 
are spot-on.
Atb
Rupert

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info On Behalf Of Brewster, Ian
Sent: 12 January 2021 14:06
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: RE: Verticillium wilt control in Norway maple

______________________________________________________________________
FLAC. The Seminar, 2021. 2 days, 8 lectures, 11 hours world-class CPD 
-Philosophy of tree risk assessment. -Practical hazard identification -Trees 
& decay fungi: a new approach. -THREATS -Forensic entomology. 
-Decision-making & tree work for risk control -Tree morphology & retrenchment 
pruning. -RAVEN
13-14 May, Forest of Arden Marriott; 20-21 May, Dundee Uni Botanics Please 
email enquiries@xxxxx.uk.com to register interest 
______________________________________________________________________

Understanding how trees become infected with this disease, the vector and how 
its spread might help with a plan of action. 
With Elm disease cutting the branch with symptoms (discoloration of 
foliage/shepherds crook) deep below the visible disease into clean wood with 
wounds showing no staining should arrest further ingress.
I hear someone recently had lopped the top of an Ash tree with Chalara and 
appeared to respond well with new growth, albeit looking somewhat different.
An expensive operation for 60 Norway maple trees but ....
Understanding how trees become infected with this disease, the vector and how 
its spread might help with a plan of action. 
With Elm disease cutting the branch with symptoms (discoloration of 
foliage/shepherds crook) deep below the visible disease into clean wood with 
wounds showing no staining should arrest further ingress.
I hear someone recently had lopped the top of an Ash tree with Chalara and 
appeared to respond well with new growth, albeit looking somewhat different.
An expensive operation for 60 Norway maple trees but ....

-----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of Phil Dye
Sent: 12 January 2021 13:49
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Verticillium wilt control in Norway maple

______________________________________________________________________
FLAC. The Seminar, 2021. 2 days, 8 lectures, 11 hours world-class CPD 
-Philosophy of tree risk assessment. -Practical hazard identification -Trees 
& decay fungi: a new approach. -THREATS -Forensic entomology. 
-Decision-making & tree work for risk control -Tree morphology & retrenchment 
pruning. -RAVEN
13-14 May, Forest of Arden Marriott; 20-21 May, Dundee Uni Botanics Please 
email enquiries@xxxxx.uk.com to register interest 
______________________________________________________________________

Hi all,
Does anyone know of any effective control measures for Verticillium dahliae  
in Norway maples other than pruning out the deadwood?
I have a client with 150 Norway maples of which 60 have symptoms of V.dahliae 
to some degree or other. I'm looking for an alternative to felling. Best 
regards

Phil 


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NPS
 -----Original Message-----
From: uktc-request@xxxxxx.tree-care.info <uktc-request@xxxxxx.tree-care.info> 
On Behalf Of Phil Dye
Sent: 12 January 2021 13:49
To: UK Tree Care <uktc@xxxxxx.tree-care.info>
Subject: Verticillium wilt control in Norway maple

______________________________________________________________________
FLAC. The Seminar, 2021. 2 days, 8 lectures, 11 hours world-class CPD 
-Philosophy of tree risk assessment. -Practical hazard identification -Trees 
& decay fungi: a new approach. -THREATS -Forensic entomology. 
-Decision-making & tree work for risk control -Tree morphology & retrenchment 
pruning. -RAVEN
13-14 May, Forest of Arden Marriott; 20-21 May, Dundee Uni Botanics Please 
email enquiries@xxxxx.uk.com to register interest 
______________________________________________________________________

Hi all,
Does anyone know of any effective control measures for Verticillium dahliae  
in Norway maples other than pruning out the deadwood?
I have a client with 150 Norway maples of which 60 have symptoms of V.dahliae 
to some degree or other. I'm looking for an alternative to felling. Best 
regards

Phil 


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