Black-arched tussock moth (Lymantria monacha) is an insect pest.
The nun moth, Lymantria monacha is a Eurasian pest of conifers that could be accidentally introduced into North America. Its establishment in this country would be disastrous because it feeds on a variety of vegetation and can migrate and colonize a variety of sites. .
For more information about this plant pest, see the CAPS data sheet and the CABI data sheet.