Reference citation: Purrini, K. and Skatulla, U. 1979. Uber die naturlichen Krankheiten der Frostspanner Operophtera brumata L. und Erranis defoliaria Clark (Lep. Geometridae) in Spessart, Bayern. Anz. schadlingskde., Pflanzenschutz, Umweltschutz, 52: 20-24.
Source citation: Sarah E Miller. 12/13/2016. Species associations manually extracted from Onstad, D.W. EDWIP: Ecological Database of the World's Insect Pathogens. Champaign, Illinois: Illinois Natural History Survey, [23/11/2016]. http://insectweb.inhs.uiuc.edu/Pathogens/EDWIP.
