I had been looking at the vines and thought they were turning into trunks….but they were doing that and getting mildew. So……what I should have been doing more often, is spraying them with 1% oil. This will kill the mildew by smothering it. Don’t want to have this over the winter as it will harm next years crop.
Later this year or early next year I will buy a little tow behind sprayer for the lawn tractor and spray every week. It took me 16 trips of 4 gallons with a back pack sprayer…..4 hours total. A lot of work.