Acknowledgements:
The authors would like to thank the many winter moth enthusiasts who helped collect samples throughout this research project. A complete list of all collaborators can be seen in Supplemental Appendix S1 Table S1. We would specifically like to thank Jeff Boettner for his many years of organizing and spearheading winter moth collection events, DeAdra Newman and Brian Griffin for laboratory assistance, and Michelle Labbé and Rodger Gwiazdowski for comments on earlier versions of this manuscript. We would also like to thank Ron Weeks at USDA APHIS for encouraging our research into the population genetics of winter moth. Funding was provided by grants from USDA APHIS AP17PPQS&T00C068, AP18PPQS&T00C070, and AP19PPQFO000C125, awarded to JSE, and USDA Forest Service, Northern Research Station award 17-CR-11242303-066 to AC.