Gypsy moth (spongy moth) in New England (1869)
French scientist Étienne Léopold Trouvelot imported gypsy moths to Medford, Massachusetts for a silkworm experiment in 1869. Some escaped, and the moth spread across the Northeast, defoliating millions of acres of forest.
Massachusetts and other states spent decades attempting control with pesticides and biological agents.
The moth remains established in New England, with periodic outbreaks causing widespread defoliation.
Shows that once an invasive insect becomes established, complete eradication is rarely achieved; long-term management is the realistic goal.
