[dice]

Could be verticillium wilt. Gardens in the Northeast get that,
and it is a hard thing to get rid of. Cold, wet soil favors it.

I had it in a few spots and containers last year. Part of a
Black Cherry recovered after I cut off all of the wilted
branches, gave it some aspirin, and the weather warmed
up. A couple of others limped along all season and produced
a few fruit that were bland at best and uneatable in one case.

In one container, a Pipo plant just keeled over completely,
while a verticillium-tolerant New Yorker plant sharing the same
container looked a bit stressed for a week and then recovered.
(I was using an ad hoc container mix that included compost
from a compost pile, old potting soil that had sat outdoors all
winter, peat moss, some fresh bagged potting mix, alfalfa from
a bale, bagged sand, etc. The verticillium could have come from
anywhere.)

The ones growing in soil that had it were replaced by
verticillium tolerant varieties this year, while I work on
coming up with some way to eliminate it besides
chemical fumigation or growing grains there for 6 years.

There are other possibilities, of course. Look close around the
base of the stem right above ground level. See any discoloration?
Any physical damage? A little hole maybe? (I did not think
Massachusetts was stem borer country, but I have not lived
there, so ....)