Meaning of phloem necrosis

phlo'em necro"sis

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease of the American elm caused by a mycoplasmalike organism, characterized by yellowing and necrosis of the foliage and yellowish-brown discoloration of the phloem.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.