Where 'bout in western MD? I'm alittle east of Cumberland. Your pictured Norway maple isn't too bad, but those are never very long-lived trees. But it could live for a few more decades.

again .. since its out in a field ... i wouldnt do much of anything about this tree ..

except if your have tree dudes coming to remove the ones in your other post .. you might have them prune out thing in the last pic ... it looks like a dead rotting formerly injured limb.. and the tree cant encapsulate the wound.. for it sticking out there .. so by properly pruning it out the tree can work on healing itself ....

this thing might only live another 30 to 50 years.. lol ... i would not worry one more minute about it ...

but one thing you might do ... since you have a glorious lawn ... is start some new smaller trees ... this weekend ... we had a grad party .. it was over 100 .. the tent fit under some trees i planted 16 years ago .. now that is what i call.. planning for the future.. lol .. and that is what you have to do with trees .. plan in terms of decades ... there is no instant gratification with planting trees ...

ken

Thanks to you all. I'll definitely have the branch removed (Issue #3) on this one.

Beng- I'm in Hagerstown. My calling it Western MD may be a bit of a stretch....

Ken - I was thinking I'd remove the other 2 dead trees myself, unless there's a really good reason to pay a tree dude to come and do it. I know stump removal can be a pain and I may consider a pro for that, but I'm sure I could chainsaw these down myself and chop em up. They are not huge trees and there's no hazards or anything in the vicinity of them. I'm open to being convinced I need a professional though....

And I'm sure I could get up a ladder/use a pole saw to prune the branch on the one in this post (Issue #3).

I'll definitely consider planting some new trees. I was already planning it in a spot where the previous owner removed one (near where the 2 dead ones are now).

Not "diseased" per se, but exhibiting some minor defects-not the same thing at all. Photos # 3, 4, and 5 show a canker-an area of sunken tissue where some decay organism is killing cambium. If taken to an extreme, a serious problem, but these are small and insignificant. # 6 shows a crack, which is very common in Norway maples. Not a big deal. The following photo shows a wound where quite likely, another branch used to rub against this one. Again, no biggie. The cankers can arise from broken branches or improper pruning. The cracks-there's a million different ideas on what causes these but I won't take the time to explain right now. But bottom line-there is nothing actionable in any of this. Tree appears healthy.

Oh and BTW, Norway maple in its native habitat is not a short-lived tree at all. Nor are those which volunteer in our woods and ravines. It is only transplanted specimens, which have had their roots cut in the process, which go on to live shortened lives as the root cutting causes much girdling root issues in this species. Your tree exhibits no sign of this problem, from what I can tell in the photos.

jockscot -- grew up in Hagerstown. Always like the trees in the Hagerstown City Park and the major cemeteries.

Huge white oak just down the street where I grew up:

http://mdbigtrees.com/tree_detail.aspx?tree=TR20121206175328767

If you can view Google street views, here's a view of a "Sweidler" Norway maple and a volunteer regular one where I grew up. The Sweidler is an old cultivar not as purple as the current ones, quite slow growing and much older than the volunteer. I even trimmed the lowest limbs off the Sweidler in the 70s, and planted the Norway spruce to the left in the background:

https://www.google.com/maps/@39.6229556,-77.7160791,3a,75y,51.31h,89.96t/data=!3m7!1e1!3m5!1sLhFwfVmdY2_k9YnRax1GaQ!2e0!6s%2F%2Fgeo1.ggpht.com%2Fcbk%3Fpanoid%3DLhFwfVmdY2_k9YnRax1GaQ%26output%3Dthumbnail%26cb_client%3Dmaps_sv.tactile.gps%26thumb%3D2%26w%3D203%26h%3D100%26yaw%3D170.67163%26pitch%3D0!7i13312!8i6656

Edit: Sorry, seems like the link is too big (at least for me) to work properly.

'Schweidler" is of roughly the same vintage as 'Crimson King', et al. Newer versions of that bronze look would be 'Deborah'. Now, with the girdling root problems well understood, not to even mention the species' basic invasiveness, I'd hesitate to recommend any Norway maple. But at least here in sconnie, the 'Crimson King' types look pretty good. Must really like the cold or something.