Maple: Anthracnose Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2026-08-28 02:15 Last edit date: 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 […]
Maple: Bacterial leaf spot and dieback Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2026-08-11 01:45 Last edit date: 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 […]
Maple: Fasciation Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:12 Last edit date: 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 […]
Maple: Leaf scorch Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:13 Last edit date: 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, […]
Maple: Nectria canker Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:14 Last edit date: 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 […]
Maple: Phyllosticta leaf spot Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2026-08-28 02:15 Last edit date: 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 […]
Maple: Powdery mildew Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:16 Last edit date: 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 […]
Maple: Tar spots Categories: Maple Maple Diseases Ornamental trees Ornamentals Last review date: 2025-07-07 10:17 Last edit date: 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 […]
Maple: Aphids Categories: Maple Maple Insects Ornamental trees Ornamentals Last review date: 2026-09-29 06:57 Last edit date: Aphid colony Photo by: Unknown Biology Various species of aphids can occur on maples. They are typically small, yellowish-green insects that feed on the leaves and produce large amounts of honeydew, a sweet, sticky material. The honeydew may […]
Maple: Cottony maple scale Categories: Maple Maple Insects Ornamental trees Ornamentals Last review date: 2026-09-29 06:57 Last edit date: Cottony maple scales on twigs Photo by: R.S. Byther Biology The cottony maple scale feeds on the leaves, twigs and branches of maples and sometimes other ornamentals including dogwood, lilac, poplar, and willow. The conspicuous adults […]