The White-Spotted Tussock Moth (Orgyia thyellina) is a species of moth of the Lymantriidae family. It is native to the Russian Far East, Japan, Korea, Taiwan and China. It was discovered in Auckland, New Zealand in 1996. Operation Ever Green was established that same year to eradicate the pest. By 1998 the species was eradicated. It is thought of as one of the most successful eradication programmes ever undertaken in an urban area.