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The gypsy moth is considered the most serious pest ot forest and shade trees in the Eastern United States. A French scientist brought it to this country from Europe in 1869. hoping to establish a new silk industry here. During one of his experiments, a few of the caterpillars escaped. Our climate and woodlands provided a suitable new home for the insect, and, in the absence of natural enemies, the wild population grew rapidly. The first noticeable defoliation occurred in Medford, Massachusetts in 1889. By 1905 the infestation had spread to Connecticut; it reached New York in 1922 and Pennsylvania in 1932. Like ripples in a pond, the outbreak continues to expand. The leading edge of the generally infested area reached Northern Virginia in 1981. In the future, the gypsy moth is expected to occupy most of Virginia and eventually most of the oak forest regions east of the Great Plains.
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