|Schlesinger Red Maple|
Also called swamp or scarlet maple,
slow-growing to 20 m. (65') Zone: 3-9
Acer rubrum 'Schlesingeri'
Red Maple: Emerging leaves have a reddish tinge changing to dark green above and pale green beneath. Fall color varies from yellow-green to brilliant red. Red flower clusters appear in early spring before the leaves emerge. The smooth gray bark is attractive in winter. Numerous cultivars are available .
Red maple is usually pest-free. Aphids infest maples, usually Norway Maple, and may be numerous at times. High populations can cause leaf drop. Another sign of heavy aphid infestation is honey dew on lower leaves and objects beneath the tree. Aphids are controlled by spraying or they may be left alone. If not sprayed, predatory insects will bring the aphid population under control. Scales are an occasional problem on maples. Perhaps the most common is cottony maple scale. The insect forms a cottony mass on the lower sides of branches. Scales are usually controlled with horticultural oil sprays applied in spring before growth begins.
Red Maple is easily transplanted and usually develops surface roots in soil ranging from well-drained sand to clay. It is not especially drought tolerant, particularly in the southern part of the range, but selected individual trees can be found growing on dry sites. This trait shows the wide range of genetic diversity in the species.
Branches often grow upright through the crown forming poor attachments to the trunk. These should be removed in the nursery or after planting to help prevent branch failure in older trees during storms. Select branches with a wide angle from the trunk and prevent branches from growing larger than half the diameter of the trunk. This will help reduce storm damage. 
1. Schlesinger Red Maple, Morton Arboretum acc. 330-82-2, photos by Bruce Marlin
2. The Morton Arboretum, Red Maple
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Family Aceraceae – Maples