River Birch struggling
Our River Birch is about 20 yrs old. Currently one trunk looks like it is dying. Pictures show if from a few different views. I know we have beetles from the chewing on the leaves, also pictured. We did a new patio adjacent to the tree two summers ago- could the roots be stressed? Or do we have something else going on? Do you recommend removing the large trunk that is struggling?
Ramsey County Minnesota
Birch trees are relatively short-lived. Here is some information from the USDA about growing birches:https://www.na.fs.fed.us/spfo/pubs/howtos/ht_birch/ht_birch.htm
It could be that you have construction damage. It often takes quite a while for symptoms to show up. The leaves look like they've been attacked by Japanese beetles (who love birches but rarely do significant damage).
I would advise having an arborist come out and look at the tree since I'm guessing you would love to keep it. Don't be afraid to ask the arborist for his/her experience. Here is additional information: http://www.extension.umn.edu/garden/yard-garden/trees-shrubs/how-to-hire-a-professional-arborist/