A Sick Maple Tree
Two questions: 1) this picture is of a branch that broke off a maple tree in our yard yesterday because of the wind. Is the "stuff" on the end of the branch indicative of a sick maple tree and 2) should my wife cut back our rose bush this fall? If so, by how much?
Your photo shows a dead branch tip. What you see growing on it is called lichens. Lichens are interesting, and completely harmless to your tree.
Here is a page about them: http://extension.umd.edu/learn/did-you-hear-story-fungus-meeting-algae-and-they-took-%E2%80%9Clichen...
No, don't cut your rose bush now. Wait until late winter or early spring, say March to do that.