About Gypsy Moth
The spongy moth (Lymantria dispar), formerly called the gypsy moth, is one of the most destructive forest insect pests ever introduced to North America, accidentally released in Massachusetts in 1869 during a failed silkworm breeding experiment. Caterpillars hatch in spring and feed voraciously on over 300 tree species, with a strong preference for oaks. They can completely strip millions of acres of forest in severe outbreak years, and trees weakened by repeated defoliation become vulnerable to secondary pathogens and drought stress. Pheromone trapping, the biological insecticide Btk, and the fungal pathogen Entomophaga maimaiga are key management tools.
Geographic Distribution
This insect is found across Oceania, with notable populations in Fiji and surrounding regions.
Management
If you suspect a Gypsy Moth problem, consult our recommended exterminator services or browse our full pest species database for related species and control guidance.