The exact food plants are unknown, but in Canada, larvae have been found on Vaccinium uliginosum and Dryas species.
Dryas octopetala (common names include mountain avens, white dryas, and white dryad) is an Arctic–alpine flowering plant in the family Rosaceae.
Recent research has been reported that at Lake Cuitzeo in the central Mexican state of Guanajuato evidence supporting a modified version of the Younger Dryas impact hypothesi---involving a much smaller, non-cometary impactor—was found in lake bed cores dating to 12,900 BP.