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maple trees

Four red maple trees with bright red leaves in the fall stand in a row by a sidewalk, with the closest tree at right and the row extending away from the viewer to the left.

Red maples, like many urban trees, are often planted in a row. If one of these maples gets colonized by gloomy scale (Melanaspis tenebricosa), it will not be long before neighboring trees become similarly infested. Diversified tree plantings may prevent such infestations from occurring. (Photo by Caleb J. Wilson, Ph.D.)

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