Maple: Fasciation categories: Maple Maple Diseases Ornamental trees Ornamentals revision date: 2022-11-25 10:01 Fasciation showing a flattened, twisted, ribbed stemPhoto 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 disease. Instead […]
Maple: Leaf scorch categories: Maple Maple Diseases Ornamental trees Ornamentals revision date: 2022-11-25 09:57 Leaf scorch on maplePhoto 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 of the […]
Maple: Nectria canker categories: Maple Maple Diseases Ornamental trees Ornamentals revision date: 2022-11-25 09:54 Tubercularia canker fruiting bodiesPhoto 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 fruiting bodies […]
Maple: Phyllosticta leaf spot categories: Maple Maple Diseases Ornamental trees Ornamentals revision date: 2022-11-25 09:50 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 centers. […]
Maple: Powdery mildew categories: Maple Maple Diseases Ornamental trees Ornamentals revision date: 2024-06-05 10:40 Powdery mildew on maplePhoto 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 or lower […]
Maple: Tar spots categories: Maple Maple Diseases Ornamental trees Ornamentals revision date: 2022-11-24 10:36 Maple tar spotPhoto 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 areas develop small, […]
Maple: Aphids categories: Maple Maple Insects Ornamental trees Ornamentals revision date: 2024-06-05 08:29 Aphid colonyPhoto 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 attract ants which feed on […]
Maple: Cottony maple scale categories: Maple Maple Insects Ornamental trees Ornamentals revision date: 2024-06-05 02:04 Cottony maple scales on twigsPhoto 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 of this large scale are […]
Maple: Verticillium wilt categories: Maple Maple Diseases Ornamental trees Ornamentals revision date: 2022-11-23 05:12 Verticillium wilt on small maplePhoto 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 wilted yellow […]
Maple: Maple bladdergall mite categories: Maple Maple Insects Ornamental trees Ornamentals revision date: 2022-11-23 05:03 Small galls on leaves from maple bladdergall mite Photo by: A.L. Antonelli Biology The maple bladdergall mite is a tiny mite that feeds on the underside of leaves. The mites overwinter in cracks and under bark scales and begin feeding […]
Madrone: Collar rot (Phytophthora) categories: Madrone Madrone Diseases Ornamental trees Ornamentals revision date: 2022-11-23 04:57 Phytophthora collar rot on madronePhoto by: R.S. Byther Biology Collar rot is caused by a fungus which lives in soil. Leaves of infected trees may be discolored, stunted or may die. Cankers occur near the trunk base, and appear sunken, […]
Madrone: Leaf blight categories: Madrone Madrone Diseases Ornamental trees Ornamentals revision date: 2022-11-23 04:55 Leaf blight on madronePhoto by: G.A. Chastanger Biology Madrone trees suffer from numerous fungal leaf diseases. One such problem, madrone leaf blight, appears to be caused by a pathogen that damages leaves after periods of cold weather in winter or early […]
Madrone: Leaf gall categories: Madrone Madrone Diseases Ornamental trees Ornamentals revision date: 2022-11-23 04:46 Madrone leaf gall (blisters) on leavesPhoto by: R.S. Byther Biology Leaf gall in madrone is caused by a fungus that infects leaf tissue. From late spring to mid-summer, fruiting bodies emerge from the leaf tissue, rupture the cuticle, and release their […]
Madrone: Leaf spot categories: Madrone Madrone Diseases Ornamental trees Ornamentals revision date: 2022-11-23 04:35 Madrone leaf spotsPhoto by: R.S. Byther Biology Madrone leaf spot is caused by a fungus that can overwinter on the leaves. More than 18 species of fungi have been reported to cause leaf spots on madrone. The spots are about 1/4 […]
Madrone: Madrone canker categories: Madrone Madrone Diseases Ornamental trees Ornamentals revision date: 2022-11-23 04:32 Black canker and peeling bark on madronePhoto by: R.S. Byther Biology Several different fungi can cause canker; they are spread by wind, rain, soil, tools, and equipment. They infect the tree at a wound and kill nearby healthy tissue. Cankers expand […]
Madrone: Madrone leafminer categories: Madrone Madrone Insects Ornamental trees Ornamentals revision date: 2022-11-23 04:28 Madrone leafminer and shieldbearer damagePhoto by: S.J. Collman Biology Larvae of this leaf and twig mining moth blaze sinuous, serpentine mines across the upper sides of leaves. Since leafminers usually cause only minor damage, they do not affect the long-term health […]
Madrone: Shield bearer categories: Madrone Madrone Insects Ornamental trees Ornamentals revision date: 2022-11-23 04:22 Madrone leafminer and shieldbearer damagePhoto by: S.J. Collman Biology Shield bearers are moth larvae that mine out elliptical pupal chambers on the leaves. When pupal cells drop off, “shot holes” or small “windows” are observed on the leaves. Shield bearers usually […]
Linden(Tilia): Leaf scorch (marginal leaf necrosis) categories: Linden (Tilia) Linden (Tilia) Diseases Ornamental trees Ornamentals revision date: 2022-11-23 02:45 Leaf scorch on linden (air pollution)Photo by: P. Kapitola, bugwood.org Biology Browning and dieback of leaf margins and tips can be a symptom of several problems that restrict water flow to the leaves. Drought, excess heat, […]
Linden(Tilia): Leaf galls categories: Linden (Tilia) Linden (Tilia) Insects Ornamental trees Ornamentals revision date: 2022-11-23 02:19 Leaf galls caused by linden gall mitePhoto by: J.R. Glass, WSU Biology Leaves of linden or basswood trees (Tilia sp.) may be infested by eriophyid mites. These tiny, worm-like or spindle-shaped mites feed on leaf tissues and cause galls […]
Linden(Tilia): Linden aphid categories: Linden (Tilia) Linden (Tilia) Insects Ornamental trees Ornamentals revision date: 2024-06-05 02:08 Linden aphidsPhoto by: W. Cranshaw, Colo St Univ, bugwood.org Biology Basswood or linden (Tilia spp.) trees planted along streets and in parking lots are commonly infested with linden aphids. The linden aphid feeds in colonies on the underside of […]