I agree with not using charcoal for sure! There is a lot of dry, dead growth on our property from years of neglect, and I would not wish to be responsible for starting a fire! I do like the dry ice method for sure! We walked the property, and the holes are too many to count. I'm thinking we should map the property in a grid, and systematically attack. If we can cover it all in a month, then do the same thing the next, and the next until we get rid of the pests and then maybe every 3 months.
I know people in my wine making forum do make muscadine wine, but they make wine from green tomatoes too! LOL! They make wine from most fruit and juice concentrates, but unlike grapes, they mainly have to add water, sugar and often raisins for body.
It is very true that humidity is hard on grapes. They like dry air, and will get powdery mildew if not sprayed with neem oil or something similar. Where we currently live, it's hot and windy, but because they water the golf course so much, the wind carries that moisture to the vines, and we have to spray for the powdery mildew too! This won't happen on the new property. Our big issue is those burrowing pests.
Thanks so much for all the great advice in this thread!
Suzi