[CANUFNET] White Blotches on Maples solved

Tue Jan 8 12:52:57 EST 2013

I have also been tracking these fungi on Norway maple for many years after
discovering what they were.they too eventually develop to lichens if the air
quality is good enough.

So if you see this you know that at least the air quality is good enough for
lichens to grow.never seen this on a very urban tree.

Philip van Wassenaer, B.SC., MFC

1248 Minnewaska Trail

Mississauga, Ontario

Canada, L5G 3S5

Tel:  (905) 274-1022

Cell: (647) 221-3046

Fax: (905) 274-2170

UFI new logo very small

www.urbanforestinnovations.com <http://www.urbanforestinnovations.com/> 

From: canufnet-bounces at list.web.net [mailto:canufnet-bounces at list.web.net]
On Behalf Of Gail Rankin
Sent: January-08-13 12:19 PM
To: Canadian Urban Forest Network
Subject: Re: [CANUFNET] White Blotches on Maples solved

I agree with the findings.  I have noticed these whitish patches on old
lilac stems and have followed them for years.  They do eventually develop
into lichen growth.

Gail Rankin, B. Sc.

Rankin Horticulture Consulting Inc

Edmonton, AB

On Jan 8, 2013, at 7:19 AM, Shields, Peter wrote:

I saw that article which confirmed what Mark and James wrote. Good stuff.

Thanks

Peter Shields

Consulting Arborist

Davey Resource Group

On 2013-01-08, at 9:17 AM, "Brian Geerts" <GeertsB at cambridge.ca> wrote:

We have had a number of inquiries about this in our area as well.  There's
also a write-up in the Orillia Packet here:

http://www.orilliapacket.com/2012/04/30/local-science-and-nature

Brian Geerts

Manager of Forestry

City of Cambridge

Dickson Centre

30 Parkhill Road W. ON N1R 5W8

geertsb at cambridge.ca

Tel:519.740.4681 x4558

Fax: 519.624.6975

  _____  

From: canufnet-bounces at list.web.net [mailto:canufnet-bounces at list.web.net]
On Behalf Of Shields, Peter
Sent: Sunday, January 06, 2013 3:56 PM
To: Canadian Urban Forest Network (canufnet at list.web.net)
Subject: [CANUFNET] White Blotches on Maples solved

With many responses to the original post, I believe this one form M.
Burleton and J. Brown at NCC in Ottawa have solved the problem.  Thanks Mark
and James! I have quoted their response with their permission below.
Perhaps a submission to Detective Dendro one year!

"The best case scenario I have so far is the un-lichenized fungus Julella
fallaciosa or white stain fungus. This isn't a algae partnership to make it
a true lichen. It is a crust (crustose), type of structure this why you
didn't find filament edges or scaly edges, you can find in other tree
inhabiting species. 

As you know lichens are composite organisms consisting of a symbiotic
association of a fungus and a green algae living together. Lichens do not
generally harm the tree or other living matter that they a growing on-they
obtain their mineral nutrients from the air. 

In some cases of the filmentose types may create heavier branches and in a
storm and could be more likely to fail because the extra weight. Growth can
seem to be stunted by heavy amounts of these lichen, but it is usually on
weaker or slower growing trees. I have seen this happen on the west coast
and in Scotland.

White stain fungus, is a "nearly" lichen, and many fungi apparently, have
acquired this mode of life. 

I looked to see if fungi or lichens in my many reference books, searching
though a few internet sites and it came out to same type of lichen like
fungus.   

This could be the first part of the association of a lichen with the white
stain fungus growing on the maple and looking for an algae associate.

In most cases the white patches are just the white stain fungus looking to
become a lichen and although unsightly, I don't believe it harm or kill
maples. In my woodlot at home, it is present on my young and mature sugar
and black maples. I haven't  seen any detrimental effects to them in 16yrs."

Peter Shields 

Senior Consulting Arborist

ISA BCMA ON-0570B, ISA PNW CTRA #1590, OMNR BHA #252, ASCA member

(905) 274-8300

<image001.jpg>

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Gail Rankin

Rankin Horticulture Consulting Inc.

ranking at shaw.ca

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