The phrase "gypsy moth" refers to a type of moth known for its ability to migrate long distances. It is usually used to describe a specific species of moth with brownish wings, that can cause damage to trees and plants. Full definition
Looking around at the tree trunks, I saw dozens, then hundreds, of gypsy moth caterpillars clinging to the bark. (dotearth.blogs.nytimes.com)
A fungus known to decimate populations of gypsy moths creates «death clouds» of spores that can travel more than 40 miles to potentially infect populations of invasive moths, according to a new Cornell study. (sciencedaily.com)
Entomophaga maimaiga, a fungal antagonist of the Asian gypsy moth variant that scientists tried to use against Trouvelot's European imports several times starting in 1910. (dotearth.blogs.nytimes.com)