The pages below contain photographs of common apple diseases and links to relevant extension publications from the past 15 years. Development of these pages is still in progress. Articles have not been updated since the time that they were written unless they contain a subhead indicating a more recent revision.
Rust Diseases: Information, photos, and links to articles (Updated 2 May 2016)
Apple Scab: Information, photos, and links to articles (Updated 28 Dec. 2017)
Powdery Mildew: Information, photos, and links to articles
Fire Blight: Information, photos, and links to articles (Updated 28 Dec. 2017)
Canker Diseases: Information, photos, and links to articles (Updated 28 Dec. 2017)
Summer Diseases: Information on sooty blotch, flyspeck, black rot, and white rot
Bitter rot: Information, photos, and links to articles (Updated 27 December 2018)
Lightning damage: Updated 24 June 2017
(Last updated 28 Dec. 2017)