Ancient and modern colonization of North America by hemlock woolly adelgid, Adelges tsugae (Hemiptera: Adelgidae), an invasive insect from East Asia

Nathan P. Havill, Shigehiko Shiyake, Ashley Lamb Galloway, Robert G. Foottit, Guoyue Yu, Annnie Paradis, Joseph Elkinton, Michael E. Montgomery, Masakazu Sano, Adalgisa Caccone & Annie Paradis
Hemlock woolly adelgid, Adelges tsugae, is an invasive pest of hemlock trees (Tsuga) in eastern North America. We used 14 microsatellites and mitochondrial COI sequences to assess its worldwide genetic structure and reconstruct its colonization history. The resulting information about its life cycle, biogeography and host specialization could help predict invasion by insect herbivores. We identified eight endemic lineages of hemlock adelgids in central China, western China, Ulleung Island (South Korea), western North America, and...
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