Maple: Anthracnose Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2026-08-11 01:11 Maple anthracnose Photo by: R.S. Byther Biology Maple anthracnose is a fungal disease affecting leaves and sometimes twigs. infected leaves develop discrete brown spots and/or blotches, often at leaf tips and often associated with the main or secondary veins. Japanese maples […]
Maple: Bacterial leaf spot and dieback Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2026-08-11 01:45 Pseudomonas leaf spot on maple Photo by: R.S. Byther Biology bacterial leaf spot and dieback is caused by the same bacterium which causes bacterial blight of lilacs and many other woody ornamentals. Symptoms include leaf spots, blackening […]
Maple: Fasciation Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:12 Fasciation showing a flattened, twisted, ribbed stem Photo by: R.S. Byther Biology Fasciation is a plant deformity which results in abnormally flattened stems. It is the result of a mutation in the growing point of the stem and is not a […]
Maple: Leaf scorch Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:13 Leaf scorch on maple Photo by: R.S. Byther Biology Leaf scorch on maple has many possible causes. Plants that are under stress, such as drought or heat stress, may not provide sufficient water to the leaf margins, causing the edges […]
Maple: Nectria canker Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:14 Tubercularia canker fruiting bodies Photo by: R.S. Byther Biology Nectria is a fungal infection which often attacks via wounds and forms cankers on twigs, branches, and trunks. The cankers are often sunken areas that develop conspicuous yellow to orange-red fungal […]
Maple: Phyllosticta leaf spot Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:15 Biology Symptoms of Phyllosticta leaf spot on many maple species include the development of small (approximately 1/5 inch), roughly circular, brown spots with dark reddish or purplish borders. Japanese maples develop yellowish or tan spots, which sometimes have transparent […]
Maple: Powdery mildew Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:16 Powdery mildew on maple Photo by: R.S. Byther Biology Powdery mildew of maple is a fungal disease which affects many hardwoods including maple, hazel, birch, and alder. On maples, a characteristic white, fuzzy or powdery growth appears on the upper […]
Maple: Tar spots Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:17 Maple tar spot Photo by: R.S. Byther Biology Tar spots are caused by a fungal infection that commonly attacks bigleaf maples and occasionally other species. In late spring to early summer, leaves develop small areas that appear water soaked. The […]
Maple: Verticillium wilt Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:22 Verticillium wilt on small maple Photo by: R.S. Byther Biology Verticillium wilt is caused by a soilborne fungus. It infects plants via the roots and then spreads throughout the plant. Symptoms on the aboveground portion on the plant include suddenly […]