Docs Making Greenhouse Calls ; in Peril of Infection, Mall Elms Nurtured by D.C. Horticulturalists

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James L. Sherald of the National Park Service dislikes the toothy look that one American elm gives the line of trees along the Mall.

The Augustine ascending elm to which he points extends above the otherwise uniform canopy and instead of branching out, grows upright. The tree, he says with a thankful sigh, is susceptible to Dutch elm disease (DED), so it will be replaced with another type of American elm once it dies.

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Docs Making Greenhouse Calls ; in Peril of Infection, Mall Elms Nurtured by D.C. Horticulturalists

The American elm, or Ulmus americana, is admired for its beauty, height, expanding canopy and ability to withstand urban stresses, along with the fact that it is an American icon, says Mr. Sherald, chief of the Natural Resources and Science division of the Center for Urban Ecology i...

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