From Andover Answers
In 1981 the town sprayed with BT (Bacillus Thuringiensis) to combat the huge influx of the caterpillars that covered the trees and houses. That year gypsy moths defoliated a record 12.9 million acres. Gypsy moths are native to Europe, Asia and North Africa. They were brought to America in 1869 by a French naturalist trying to breed them with silkworms. Some of the larvae escaped during his experiments in Medford, MA.
Town annual reports, 1979-1984.
--Glenda 15:28, October 2, 2006 (EDT)
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