On May 15-19, 2013, David Voegtlin (retired entomologist, Illinois Natural History Survey) and Dave Hogg (professor, University of Wisconsin, Madison) surveyed the overwintering hosts of soybean aphids – the common buckthorn (Rhamnus cathartica) and glossy buckthorn (Frangula alnus). Their 2,000+-mile survey of these primary hosts took them across Illinois, Indiana, Michigan, Minnesota, Ohio, South Dakota and Wisconsin. A synopsis of their observations by state are provided below.

  • Illinois – aphid colonies found in Mississippi Palisades State Park, Savannah, Illinois; Quad Cities – surveyed three sites, aphids numerous at one location, present at two remaining sites; Joliet – discovered some small colonies, overall aphids not numerous
  • Indiana – aphid colonies easy to find near LaPorte and Rome City
  • Michigan – aphids discovered near Augusta, not numerous
  • Minnesota (western) – no aphids found
  • Ohio – aphids were abundant near Toledo (Secor Park)
  • South Dakota – no aphids found
  • Wisconsin – aphids found near Prairie du Chien


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