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National Arboretum, a great place to visit on your trip to the nation's capital, contains not only a fabulous collection of trees, but also a group of scientists and researchers seeking answers to forest health problems and breeding a new generation of cultivars, like a new American elm that can withstand Dutch elm disease. The fungus that causes Dutch elm disease makes an infected tree strengthen its odors, attracting beetles that carry the fungus on to the next tree, researchers have found. The ash borer's presence has resulted in the destruction of more than 50,000 trees in Essex County near Windsor, many of which were replanted in cities and towns after Dutch elm disease went through in the 1970s. |
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