Considering that your problem has occurred over the last two seasons, dice might be on to something. It sounds like it almost has to be a soil problem, maybe even a soil-borne disease which would not have been eradicated by the addition of compost and manure. Do you have anything growing in a container with a different soil mix? As you know, I'm only 10 miles from you and I'm having a very, very different experience than yours this season.
So sorry to hear this news. You are a dedicated, knowledgeable gardener. I hope you can figure out what it is.
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