The cabbage looper is the caterpillar of a grayish moth with a silver spot in the middle of each wing. You can distinguish them from the cabbage worm by looking for 4 white stripes running down the body. The eggs are dome-shaped, light green, and are laid on the underside of the leaves.
Corn earworms (also known as tomato fruitworms) are small caterpillars that vary in color from different shades of brown, yellow, pink, green, and black. The light yellow adult moth lays white, circular eggs on leaves or corn silk in the spring time. The earworm consumes the silk and then moves on to the ear. On other plants, earworms consume stems, leaves, and fruit.
Tomato hornworms are huge caterpillars that are green with a spiky tail and orange spots on the abdomen. These giants are monsterous and can destroy a tomato plant in the course of a day, so it is important to catch them fast!