I have only been living in my current residence in Caledon, Ontario for a few weeks. The previous owners had planted a red japanese maple that must be at least 6 years old (I'm not sure of the exact variety, and I know very little about japanese maples altogether). I have noticed that the leaves on some of the branches are completely shrivelled and dry, but do not fall off the branch. On other branches, it looks like the tips of the leaves are starting to get dry and shrivelled and perhaps slowly moving up the entire leaf. Being in southern ontario, we have not had any extreme temperatures, basically just 22 degrees celcius in the day and plenty of rain. One friend of mine who is a hobby gardener had said she heard that this disease was going around Ontario and suggested I cut off the sickened branches. I did cut the branches this morning that looked the most shrivelled, but I'm worrying about killing it. Does anyone have any information about what may be causing this?