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scales on branches

Published at 3000 × 2000 in Are Trees in Species-Rich Urban Plantings Less Susceptible to Pest Damage?

Two-part image: Left side shows tree branches over a suburban sidewalk, and on which many small bumps can be seen. Right side shows a close-up on a tree trunk with the same small bumps covering nearly all of the bark.

Gloomy scales (Melanaspis tenebricosa) can be highly abundant on red maples in cities. At left is an infested branch from a young red maple, while the close-up at right shows how densely clustered gloomy scales can be on red maple trunks. (Photos by Caleb J. Wilson, Ph.D.)

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