I'm hoping that someone may be able to help diagnose a problem with a maple tree on my lot in the Toronto, Ontario area (zone 5).
Short history: We moved to this home about 18 months ago and were told that this is a "globe maple", perhaps 10 years old. The previous owner claimed that it had been quite wide in 2002-3, extending almost to the house in the background (12-15 feet). Because of this it had been pruned back to approx. 8-10 feet in diameter. It is now approx. 12-15 feet across. I've posted pictures to Webshots showing the tree from base to tiptop. http://community.webshots.com/album/371776352TmMgNe?762
The problem: One side of the trunk has apparently had some blistering or trauma in the past (photos 1 2 5 7 8) and this has returned in parallel strips as seen in photos 1 2 3. The extent of the earlier damage in the 'ball' of branches can be seen in photos 4 5 6 8. The new split in the bark often weeps sap/liquid all the way to the ground. (Difficult to detail as it has rained lots in the last 10 days.) Recent storms have blown a couple bushels of curled leaves out of the tree. The tree is shaded only in the very early AM and after ~4:00pm by the house next door. Like all maples in this region, leaves last fall were largely covered in mold but no other maples (we have 3 others and many neighboring) are similarly ailing like this globe.
This is a photo of a similar, younger, but apparently healthier specimen in the same climate zone, with description. http://www.city.hamilton.on.ca/Parks/Forestry/images/Species_Globe.JPG
GLOBE MAPLE Norway Maple variety, dense round form Ball shaped crown Fast growing to 25' spreads to 15' Pale green leaves, fall colour is yellow Suited for small lots or under hydro lines
This three is great for shade so I'm hoping that it will survive many more years, but this blistering and splitting of the bark is worrisome. Can anyone provide info/advice?
Thanks, -- + Tom + antonomasia-at-canada-dot-com