Posted: 14/07/2014 at 18:34
It doesn't sound good Kleeblatt.
You couldn't damage a main root without knowing you'd done so and willow can put up with that sort of thing anyway. I doubt if wood chip have any adverse effects either.
Is it grafted? If so does all look well there, no rot or damage anywhere on the trunk?
I don't think you can post photos from a phone which is a pity.
If there are healthy bits I'd take a cutting or two.