Pear blight Meaning, Definition & Usage

  1. noun a disease blackening the leaves of pear and apple trees
    fire blight.

WordNet

Definitions
  1. . (a) (Bot.) A name of two distinct diseases of pear trees, both causing a destruction of the branches, viz., that caused by a minute insect (Xyleborus pyri), and that caused by the freezing of the sap in winter. A. J. Downing. (b) (Zoöl.) A very small beetle (Xyleborus pyri) whose larvæ bore in the twigs of pear trees and cause them to wither.

Webster 1913