Greg,
Did you net your Frontenac Blanc?
I am not sure what I think of my Frontenac Blanc vines. Lost last year's crop for the same reason you did this year. This year, I pulled leaves and netted in an effort to get it ripe and off the vine with minimal pest damage. Keeping the birds off it also kept the bees and wasps away, so that part was a success. Unfortunately, I must have pulled too many leaves. I ended up with sun burn that in turn lead to some rot on the most exposed berries. Very frustrating because the shaded berries tend to still be green and under ripe.
My berry sample at harvest was 24.6 brix, 3.12 pH and a TA around 15. A sample of pressed juice came in at 25 brix and a pH around 2.92. This variety is advertised as a La Crescent replacement for people that have problems with La Crescent in the vineyard. In two fruiting seasons, my La Crescent has given me way fewer problems. We will see how the wine turns out.
H