When the wasp larva leaves the egg it beings eating the blood and fat of the corn earworm. In a short period of time, the earworm dies. The wasp lays only one egg in the worm. If another worm attacks the plant, it will release another chemical signal. The wasp may return to the plant if it smalls the chemical. But, having marked the first worm with its own special smalls, the wasp will pass it by and look for the second worm