[CANUFNET] Mystery linden disease

[Hennessy, John]

Hi Alex,

Your question has prompted me to think a little more about a few Tilia.c. I have been noticing what I thought to be random mortality of the species. I have not had a good look which I will do tomorrow, my assumptions were mechanical damage but their decline cycle was so fast (1 season) I will be out to do a little more research, your e-mail has got me reconsidering? All of these trees in question range from 15-25cm dbh( 7 trees ). I will be going back to look for Japanese Beetles and now verticillium. Two of these trees had no leaf scorch, just early leaf drop last season, and now mortality this season? We had Japanese beetle issues brought to our attention from some gardeners in one location, in the vicinity of one of the trees. Don't know if there is a correlation to be made just a thought at this point. I'll follow up after I've finished my homework!

John.

From: canufnet-bounces at list.web.net [mailto:canufnet-bounces at list.web.net] On Behalf Of Alex Satel
Sent: 2012/05/14 4:20 PM
To: canufnet at list.web.net
Subject: [CANUFNET] Mystery linden disease

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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