Meaning of angular leaf spot

an'gular leaf' spot"

Pronunciation: [key]
— Plant Pathol. Plant Pathol.
  1. a disease of plants, characterized by angular, watery spots on the leaves and fruit, caused by any of several bacteria, as Pseudomonas lachrymans.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.