Penn State Extension office has a nice article with great photo’s on Pyracantha Diseases. Great article to add to your library. Fire Blight is a problem in my yard with my landscape crab apple. So far it has not spread to anything else. I have added the article to the Pyracantha tree page, listed under Deciduous trees and Bonsai Tree Information.

Photo courtesy of Penn State Extension. Scab on foliage and fruit.