[CANUFNET] Mystery linden disease

[Shields, Peter]

If no exit holes are seen (lilac borer is also possible), perform a quick root flare inspection to check for girdling strings and roots, may be a few cm below grade.  There is usually a cause to the general decline or other infestations into trees.  We are mostly at fault…

Peter Shields
Consulting Arborist
Board Certified Master Arborist, ISA BCMA ON 0570B
ASCA Member
Forest Technician
Davey Resource Group, A Division of Davey Tree Expert Company
Cell (647) 465-4901


From: canufnet-bounces at list.web.net [mailto:canufnet-bounces at list.web.net] On Behalf Of Jozef Ric
Sent: Tuesday, May 15, 2012 8:36 AM
To: canufnet at list.web.net
Subject: Re: [CANUFNET] Mystery linden disease

Hello Alex.

It might be a damage caused by Chrysoclista linneella,  a linden borer. It is an European introduced specie.


Jozef Ric
Forest Health Care Inspector
Urban Forestry

355 Lesmill Road,
Toronto, Ontario, M3B 2W8
Tel: 416 392-1436
Fax: 416 392-6658
e-mail: jric at toronto.ca<mailto:jric at toronto.ca>

>>> "Alex Satel" <asatel at ufis.ca<mailto:asatel at ufis.ca>> 5/14/2012 4:20 pm >>>
Hello CANUFNET,

About a year ago I began noticing a peculiar affliction affecting two mature littleleaf linden (Tilia cordata) trees in an older neighbourhood in Toronto. Symptoms appeared as the leaves first wilting, then falling off. Both trees also sprouted very heavily near the base and in the lower canopy, as if responding to some shock. This year they are completely dead. The disease (or whatever it is) appeared to progress very quickly.

Being that the trees are located at a frat house, I figured they might have been poisoned as a prank, but the grass is very green below (no herbicide injury, then…) and I noticed another linden in the same area with the same symptoms, now also dead. Verticillium wilt might also be a culprit?

Anyhow, today, while touring through a much younger community (1970s), I noticed many of the lindens in the area showing similar symptoms – some had stunted and wilting foliage, while others were totally dead.

It’s a bit puzzling. Anyone have any insight on what might be causing this in what is supposed to be a fairly hardy urban tree? Anyone else noticing this on their lindens?

Cheers,


Alex Satel, MFC
ISA Certified Arborist ON-1353A
Urban Forest Innovations Inc.
1248 Minnewaska Trail
Mississauga, ON  L5G 3S5
T: (905) 274-1022
asatel at ufis.ca<mailto:asatel at ufis.ca>
www.urbanforestinnovations.com<http://www.urbanforestinnovations.com/>
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