Monoculture raises disease risk for trees at Gateway Arch in St. Louis

06/18/2013 | St. Louis Post-Dispatch

The decision to use only London plane trees to replace dying ash trees at the Gateway Arch in St. Louis could raise the risk of a disease killing off all the trees, experts say. A black fungus known as "canker stain" is threatening London plane trees in Europe. However, the National Park Service opted to adopt a monoculture approach at the arch grounds to keep with tradition, according to Bob Moore, a historian at the site.

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