Can’t seem to get canning tomatoes to work

I can’t seem to get any variety of canning/plum tomatoes to work in my garden. I’ve tried San Marzano. This year it was Opalaka. I can’t even remember what I did last year. And, I think there was a Roma in there somewhere. The always get diseased more than any other variety and if the ripen at all it’s very late. I think I got three tomatoes off of two plants this year. See below. Ugly!



Christmas Dinner 2018

Warm Salad of
House-Made Duck Confit,
Poached Quince, Toasted Pistachios, Duck Cracklings
Potato Leek Soup,
Aged Cheddar, Parsley Oil

Roasted Long Island Duck Breast,
Parsnip Puree, Haricot Vert,
Oyster Mushrooms, Marsala Reduction