It appears that cutworms have just about killed five of my tomato plants. I
noticed two plants wilting today and thought it was because of lack of
water. But closer inspection showed about a 1 inch eaten away of the green
stalk leaving just the brown core.

I thought cutworms only attacked seedlings? These plants have been in the
ground over a month and are 2 feet tall. I have wrapped the base of the
remaining healthy stems with aluminum foil per the recommendation of a
Rodale book.

Even though some of the affected plants still appear ok, will they die?

This season stinks.......