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Norway maple, red maple and sugar maple are the species most commonly affected. The trouble often starts after insect-induced defoliation, which weakens the trees and makes them more susceptible to secondary pathogens. Early signs of decline include small or scorched foliage, and premature fall colors on some of a tree's branches.
Acer negundo, also known as the box elder, boxelder maple, Manitoba maple or ash-leaved maple, is a species of maple native to North America from Canada to Honduras. [3] It is a fast-growing, short-lived tree with opposite, ash-like compound leaves.
Several trees normally have marcescent leaves such as oak (Quercus), [5] beech (Fagus) and hornbeam (Carpinus), or marcescent stipules as in some but not all species of willows . [6] All oak trees may display foliage marcescence, even species that are known to fully drop leaves when the tree is mature. [7]
Sugar maple is best known for being the primary source of maple syrup and for its brightly colored fall foliage. [4] It may also be called "rock maple," "sugar tree," "sweet maple," or, particularly in reference to the wood, "hard maple," [5] "birds-eye maple," or "curly maple," the last two being specially figured lumber. [6] [7]
Acer saccharinum, commonly known as silver maple, [3] creek maple, silverleaf maple, [3] soft maple, large maple, [3] water maple, [3] swamp maple, [3] or white maple, [3] is a species of maple native to the eastern and central United States and southeastern Canada. [3] [4] It is one of the most common trees in the United States.
For example, arborists are frequently called upon to analyze the danger posed to people or property by a damaged or decaying tree. By knowing how decay is likely to spread, such hazard tree analyses may be more accurate, thereby preventing unnecessary tree removal, property damage, or injury. [citation needed]
Acer macrophyllum, the bigleaf maple [2] or Oregon maple, [3] is a large deciduous tree in the genus Acer. It is native to western North America . In addition to uses by animals, it is of some culinary and woodworking interest.
On mature trees, sugar maple bark is more shaggy, while Norway maple bark has small, often criss-crossing grooves. [ citation needed ] While the shape and angle of leaf lobes vary somewhat within all maple species, the leaf lobes of Norway maple tend to have a more triangular (acuminate) shape, in contrast to the more finely toothed lobes of ...