Our chards also appear to be rotting, though I can't figure out why. Kales are fine so far, ditto the eggplants. Can the sun please come out already?
This site suggests that the squash borers are a recurrent problem with zucchini, squash, etc unless the plants are removed and destroyed, and spraying is practiced.
Sevin is a pretty extreme response
Thanks. It's worrisome that they could overwinter. Hello, chemicals, bye-bye gross little bore worms.