I should say yes! They haven't ravaged mine but they have munched on the leaves to the point where there's a bunch of leaves with a bunch of holes in them. This seems to vary year to year. Last year my columnar European hornbeam had the worse JB attack but this year not so bad.

having followed mary.. thru a half dozen of these forums... and enjoying the heck out of helping her ... i was trying to question her ID .. mary.. do you know for a fact this is a plane ....??? it matters.. when you compare... calliopes answer with mine ... pic of the leaves.. the bark and the whole.. might get you an ID ... so we can be sure we are all talking about the same tree ... as i said.. i dont know the latin on the ones i grew up with ... we just called them sycamores .... since we moved in t here in 1965 and dad was no botanist ...... they were planted when the sub was built in 1958 or so ... so they would not be any fancy hybrid.. developed since ... regardless.. i still maintain.. its not in a bad place ... according to your words .... ken

the first question is whether the plant was grafted ... the second question is.. whether it is a sycamore or a plane ... or what exactly it is ... this is more of a curiosity ,... where are you??? third question ... is it really a root sucker ??? ... or did it sprout from the old stump ... something tells me.. and i might be wrong.. that sycamore does not root sucker ... the basic problem is that you could potentially end up with hundreds of them . and what are you going to do then ... its not like you can isolate a single one ... ken

Hello, saw your post and thought I might have a little insight to your issue. First you do realize there is a difference in the Canadian Zone chart to the US zone chart right? They are not the same. Here is one article speaking to that exact issue. I am sure there are many more out there . Might be of interest to you and might explain why your tree did not survive. https://laidbackgardener.blog/tag/comparing-us-and-canadian-hardiness-zones/ Hope this helps.