How I get rid of a Phylloxera grapevine infestation?
What kind of vines are these, and where are you? Concord grapes, OP says. It might not be phylloxera, you know. It could just be harmless galls caused by insects. The Thompson seedless vines in my neighbor’s yard get galls every year. The vines are 30 years old and could withstand a nuclear blast are prolific. They’re not affected at all. Even if it is phylloxera, it’s not damaging unless it affects the roots. And if it has, you’ll have to pull them out and start over with a resistant rootstock. If you’re handy, you might be able to graft your existing vines onto a hardy roostock, but you might as well just buy new plants. Don’t panic until you know for sure, though. Could be garden variety galls. The suggestion to try your local ag extension is a good one.
