Parasites include the tachinid flies "Sturmia convergens" and "Lesperia archippivora". Caterpillars that have the "Lesperia archippivora" maggots inside them will finish their last molt. They will then hang upside down on a horizontal surface. They die before they turn into a chrysalis. At that time one white maggot comes out of the caterpillar. The maggot then forms a brown pupa on the ground.