Probably tomatoe hornworm...
They can be VERY rapidly destructive!

Find the critter, kill it, then most of the leaves should grow back.

You can spray the plant with liquid sevin. It biodegrades.

K.

Please read up on Sevin before you use it. It does biodegrade, but it's
more complicated than that:
http://pmep.cce.cornell.edu/profiles...baryl-ext.html

http://www.pesticide.org/carbaryl1.pdf

http://www.ourstolenfuture.org/NewSc...eaandmills.htm

Sue

--

Zone 6, South-central PA