: a sticky grass (Triodia flava) of the eastern U.S. with purple panicles
purple-top
2 of 2
noun (2)
variants or less commonly purple-top wilt
: an insect-transmitted and often fatal disease of potato plants caused by the same virus that produces aster yellows and characterized by a purplish or chlorotic discoloration of the top shoots, swelling of axillary branches, and severe wilting