That must've been a cool thing to watch. I had a big hornworm on one of my potato plants this year. I didn't know they would eat those. I haven't found any on my tomatoes yet. They have big appetites. : (

I never find them until they are big fat guys. I read that 90% of their damage is in the last instar before turning to a pupa. I am not spraying for them unless the damage gets out of control. I am experimenting with garlic for a spray. I know it made the lacebugs leave my sun flower. I do not have directions for how to make it although I looked it up on line. I didn't measure just crushed some garlic in water and strained it then added more water in the sprayer. The sun flower area made me hungry the next day. I don't like to spray with Sevin unless I have to, but I will be spraying around my house today. Ants are getting in my cat and dog food so I will put it up and spray around the house.