Genomics-based assessment of the geographic origin of spongy moths (Lymantria dispar) intercepted during vessel inspections, using SpongySeq, an amplicon sequencing panel

Invasive alien species (IAS) are a major threat to native biodiversity, ecosystems services, economic stability and human well-being. The two spongy moths, Lymantria dispar asiatica and L. dispar japonica, native from Asia, are important defoliators of a wide variety of hardwood and coniferous trees, and the risk of their introduction into North America via sea transport is considered high by plant protection regulatory authorities. To prevent such introductions, a cost-effective approach consists in reducing the likelihood that IAS will enter the invasion pathway. This involves identifying the geographic origins of moths intercepted during vessel inspections in North American ports and implementing preventative measures in those foreign ports identified as the sources of moths. In the present work, we designed a genomic-based method for the accurate identification of the geographic origins of intercepted spongy moths. To this end, we developed an AmpliSeq panel, named SpongySeq, using genotyping-by-sequencing-derived SNP obtained from 1156 spongy moths collected at 61 sites in 25 countries.