I have not been able to get sufficient grapes off my vines to make wine for at least 8 years now. I have Frontenac and St. Pepin.
Frontenac is savaged by blackrot every year and it gets into the clusters and destroys 50-75% the grapes. I have sprays for it, of course, but it seems like one would have to spray after every rain or heavy dew, which these days amounts to about every other day in May to July.
Besides spraying on an almost daily basis, how do you avoid blackrot and downy mildew?
I have heard that Marquette is much more resistant to BR and other diseases. Anyone tried those vines?
Grouse
Our Frontenac grapes are nuts this year…the same as last year only better.
Can’t control the weather in the least and some of what you mention is air-borne so while your ground may not support those problems your neighbors blight might be your enemy….spraying will help if you’re willing to invest in it. The mildew can be controlled with sulpher powder applied when the leave are damp [early morning] and will last for several rains. Mildew has to “develop” and after the treatment can take several weeks to reappear.
Try fertilizing with 10-10-10 late in the fall after the growing season has ended. This puts the nutrient in the ground but now so much that the vines are all growth the following spring. Cut the vines back well too after the growing season ends. My grapes look like he// after I trim but fill right out the next year.
The Marquette variety you mention has been brought up a couple times for not doing too well here in the Rochester area but I don’t know if its the grower or the environment, but then too the Frontenac sees the same kind of critique. The kids have two Frontenacs on an arbor and last year they had a bumper crop they couldn’t keep up with while this year they won’t get a grape.. Do some research on the variety before buying.
Grapes can be weird plants. Our grapes are all planted in the roughest, driest, crap soil we have in the yard and get only the water nature sees fit to put on them and they usually do very well. I was told the worse the soil the better the vines and grapes….no idea if that holds water but it sure fits the description of what we have here. Lots of small pieces of field stone, gravel from a river beds and some clay in with the dirt. 10-10-10 in the fall, cut them back and watch for problems next spring. Sulpher powder and Sevin seem to be the only things we use if problems crop up.
And I’ll note here that what’s in the fermenter right now was only about 2/3 of what we have on the vines. The rest hadn’t turned yet so we still have a mess for table grapes.