Hawthorn: Fire blight Categories: Hawthorn Hawthorn Diseases Ornamental trees Ornamentals Last review date: 2026-05-15 11:49 Fire blight infected leaves Photo by: G.G. Grove Biology Fire blight is a bacterial infection of shoots which enters the plant through blossoms, vigorously growing shoot tips, young leaves, and wounds. Blossom clusters appear blighted. Shoots suddenly wilt, turn black […]
Hawthorn: Leaf spot Categories: Hawthorn Hawthorn Diseases Ornamental trees Ornamentals Last review date: 2026-05-15 08:57 Hawthorn leaf spot Photo by: R.S. Byther Biology Leaf spot is a fungal disease which can infect hawthorn, photinia, pear, pyracantha, crabapple, and related species. Initial infections are small reddish-brown to grayish spots on the upper or lower leaf surface. […]
Hawthorn: Rust Categories: Hawthorn Hawthorn Diseases Ornamental trees Ornamentals Last review date: 2026-05-15 09:39 Rust pustules on underside of serviceberry leaf and on petiole Photo by: R.S. Byther Biology Rust is a fungal disease typically infecting leaves of hawthorn (occasionally also apple and crabapple). It may also be found on green stems and fruit. Initial […]
Hawthorn: Scab Categories: Hawthorn Hawthorn Diseases Ornamental trees Ornamentals Last review date: 2026-05-18 06:56 Apple scab on leaves and young fruit Photo by: R.S. Byther Biology Scab of hawthorn is caused by the same fungus that causes scab on apple and crabapple. The disease infects during wet weather in the spring and initially causes small […]