James Mayer said:

They are little worms that get in the cucumbers and in the stems,
killing the stems and boring holes all through the fingerlings. What
are they do and what I do to get rid of them, and what do they look
like as adults?

Possibly pickleworms. Not a pest I see here in Michigan. The adult is a moth.
Bt is likely to be of limited value as the larvae move into the fruit.

See: http://www.ces.ncsu.edu/depts/ent/no...1e/veg001e.htm
--
Pat in Plymouth MI

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)