Coleophora deauratella (red clover casebearer).
Abstract Coleophora deauratella is a moth species native to Europe, eastern Siberia and the Middle East. It was introduced into North America in the 1960s, becoming a significant pest of Trifolium pratense seed crops in Ontario, Canada in 1989. Based on a study of genetic diversity from a limited number of European populations of C. deauratella, the most probable source of North American populations was found to be Switzerland; further sampling within Europe may improve geographical resolution of the source population. Within North America, C. deauratella has been identified as an invasive in Alberta and Ontario in Canada and Oregon and New York in the USA. It has been an invasive pest in New Zealand since its discovery there in 2015, where it has devastated T. pratense crops.