The tomato hornworm’s tail is dark blue-black instead of reddish, and it does not have a horn. The tail color and markings are what set the two apart. The tomato hornworm (Manduca quinquemaculata) and the tobacco hornworm (Manduca sexta) both appear to be similar in appearance.
Despite their stinger-like tail, tomato hornworms are harmless to humans and will not sting them. You may safely remove the caterpillar by hand if you notice one beneath the leaves or crawling on the stems. Since they blend in well with their surroundings, identifying tomato hornworms on plants might be difficult. To help protect itself from predators, it has eyespots on either side of its head. On the apex of the white V-shape, you may see tiny eye-like markings. The V-shaped yellowish-white stripe along the sides of the pale green tomato hornworm is another way to identify it.
The tobacco hornworm has a reddish, horned tail, whereas the tomato hornworm’s tail is dark blue. The tomato hornworm is distinguished from the tobacco hornworm by its coloration at the tail end. The black or dark blue pointed protrusion at the tail of tomato hornworms gives them their name. They have an expanded head that is curled inward and five pairs of enormous prolegs on their center segments. Hornworms as large as 5 inches (127 mm) long have been seen. Tomato hornworms are huge caterpillars with green bodies, a blue black tail-like horn, and white V-shaped markings on either side.
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