This image shows a dog-strangling vine root crown split in half. You can see why it is so difficult to dig this plant up. In fact, digging as a means of eradication or control is viable only when the infestation is minor. Even so, be prepared for back-breaking work!

For a brief intro to this invasive plant, and more photos, please see: http://www.pbase.com/fwg/dsv_at_fwg