Crabapple: Powdery mildew categories: Crabapple Crabapple Diseases Ornamental trees Ornamentals last review date: 2026-04-24 11:28 Powdery mildew on apple leaves Photo by: R.S. Byther Biology Powdery mildew of crabapple is typically seen on the foliage, but may also occur on twigs, blossoms, and fruit. Characteristic patches of white, powdery fungus develop on the leaves and […]
Crabapple: Scab categories: Crabapple Crabapple Diseases Ornamental trees Ornamentals last review date: 2026-04-24 12:20 Apple scab on leaves and young fruit Photo by: R.S. Byther Biology Scab of crabapples is caused by the same fungus which causes scab on apple and hawthorn. The disease infects during wet weather in the spring and initially causes small, […]
Crabapple: Stem rot categories: Crabapple Crabapple Diseases Ornamental trees Ornamentals last review date: 2026-04-24 12:30 Crabapple stem rot: rotten stem has a dark blotch Photo by: R.P. Regan Biology Stem rot of crabapple is caused by a soil-borne fungus. This disease is most prevalent in the winter on nursery stock. The fungus infects through wounds […]