Pear Rust, the underside of the leaf

Description:

Summary[edit] Description: English: The lower surface of a leaf on a 'Doyenne du Comice' pear tree in central southern England. This is an infestation of 'gymnosporangium sabinae. Commonly known as Pear Rust or Pear Trellis Rust. Date: 10 October 2020, 14:47:43. Source: Own work. Author: Richard Avery. Camera location51° 04′ 12″ N, 1° 49′ 12″ W View all coordinates using: OpenStreetMap 51.070000; -1.820000.