I have a neon green worm eating my tomatoes. It's not a hornworm, though. Can you tell me what it is?
It is hard to say with any certainty as there are literally tons of worms/caterpillars that it could be. Regardless of the worm, however, Bacillus thuringiensis (Bt) can be sprayed on the plants. This insecticide attacks the digestive system of the insects but is not harmful to humans or plants, so using it on tomatoes is safe. Neem oil is also helpful. These articles should help: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/using-bacillus-thuringiensis.htm