The tobacco hornworms (Manduca sexta Linn.) can be distinguished from the tomato hornworm by the seven diagonal white stripes and the curved red horn.  The tobacco hornworm can be very destructive by chewing large irregular holes in a tobacco leaf. (Phot by Ben Meredith, ANR agent for Woodford County, KY)

Hornworms may also consume a signifant amount of tobacco in the barn.  Those infested with Apanteles wasps (white egg cases) may live for several days, but do not feed (see photos below).  Hornworms will eventually drop to the ground to pupate.