I have had good luck against tomato hornworms using soap-based sprays,
with the side effect that the formerly-scruffy tomatoes went berserk
and grew HUGE, and made more tomatoes than we could possibly eat.
(Probably due to potassium salts in the soap)

~REZ~

What kind of soap, Rez? Those with scrawny tomatoes want to know!

Ev
No kidding...I wanna know too...