The differences between the two species are the V-shaped markings on the side of the body are yellow-white in tomato hornworms but white-black diagonal line-like in tobacco hornworms. Full-grown caterpillars can measure up to 4 inches in length. As they grow and molt, their body turns green in color and develops V-shaped markings on each side and a pointy horn-like tail at the end of the body. Newly hatched young hornworms are yellow to white with no markings.
Hornworms are huge, beautiful caterpillars. They are closely related species that look similar in size and appearance and cause similar damage to the same host plants.
One is the tomato hornworm ( Manduca quinquemaculata), and the other is the tobacco hornworm ( M. There are two species of hornworms both are the common garden pest of Solanaceae plants.
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