It is about the time when a disease attacked the traditional silk moth in North America in the 1860’s. The cotton industry was sinking. With the intention of developing the silk industry, a person named E. Leopold Trouvelot brought various species of moths for experiments from France and kept them in his home under protected conditions. The species also included gypsy moth’s eggs. The number of gypsy moth caterpillar increased tremendously when some of them escaped and spread through the wing. They became so common in Medford Massachusetts that trees used to be all covered with them. They created a real trouble for the villagers by making the plants and trees almost disappeared. By 1941, it had become common in the north-eastern United States. Gypsy moths have now spread to other parts of the United States and even in Europe.
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