Hi, I have a Sand Cherry tree that became infested with aphids in the beginning of the summer, we managed to eradicate them using pesticides and a pressure sprayer. Now that they have gone I have noticed sap on the bark (I assume is a good thing) but a lot of the branches are dead, when i bend them they snap like dead wood. I have a few new sprouts on the tree but nothing extraordinary. Would you recommend chopping the tree down, removing all dead branches leaving a lopsided tree or just wait it out? I also have a choke cherry about 50 feet away that is heavily infested with black knot, will it affect this tree. I have not seen any of the black knot on it though...

http://imageshack.us/photo/my-images/818/photo14g.jpg/
http://imageshack.us/photo/my-images...hoto24tnw.jpg/
http://imageshack.us/photo/my-images/163/photo34w.jpg/

Input is appreciated.

Thanks!