Lettuce mosaic potyvirus - aphids, seed borne. Pepper Mottle potyvirus. Control - avoid alfalfa. Moves into new spring foliage for pick up by aphids. Vectored by Beet leaf hopper.
Plant is usually very stiff - due to phloem damage.
Control - remove weeds, diseased plant. Puckered but not as chlorotic as AMV late summer Overwinter in Datura.