While some of the Asian species that have disrupted Mid-Atlantic ecosystems arrived as stowaways, several others were brought here on purpose.

Sources: Chesapeake Bay Program, Maryland Sea Grant, U.S. Department of Agriculture, Smithsonian Environmental Research Center, EPA, U.S. Apple Association, Maryland Department of Agriculture, Virginia Department of Conservation and Recreation | Graphic: Bonnie Berkowitz /The Washington Post August 7, 2011
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