Dying branches

I have Some outdoor plants that are in the ground and there about up to my belly button so far. some days ill lose a branch it will be wilted and fall off easy and when i open up the branch it will be a lightly brown and black on the inside ill upload pics when i get the chance any body know what it could be just off what i described ?

Pics will help, sounds like a bacteria/fungus or even a borer.