halo blight

noun
  1. a disease of plants, characterized by small, necrotic leaf or fruit lesions surrounded by a yellowish, halolike band, caused by any of several bacteria of the genus Pseudomonas.

Origin of halo blight

First recorded in 1915–20
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018