The battle against Dutch elm disease continues, but the front grows broader every year. A fungus borne by tiny bark beetles that kills the stately Ulmus americana by causing its circulatory system to clog up, the disease first arrived in the U.S. from Europe in the early 1930s. In the past few years, it has crossed the Rocky Mountains and reached California and the eastern portions of Oregon, where it threatens to spread as rapidly as it has in the rest of the nation. At present, the fungus is killing trees at a rate of 400,000 or more every year, at...
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