I've found something that seems pretty helpful. It's informative if nothing else. I've tried most of what they suggest, as far as cutting the grub out, applying pesticide and covering the joints with mud to encourage more rooting. Next, I'll have to try some sort of covering, looking for and destroying eggs and perhaps wrapping the vines in nylons.
Here's the site: http://ohioline.osu.edu/hyg-fact/2000/pdf/2153.pdf