Xyleborus affinis Eichhoff colonized wind thrown timber in the moist floodplain habitats of Central Michigan. Single adult females constructed a complex gallery system consisting of phloem–sapwood interface tunnels and sapwood tunnels. An average of 24 progeny adults and a sex ratio of 14 females to 1 male were found in mature galleries after the first of September.
Roeper, Richard A.; Bunce, Mark A.; Harlan, John E.; and Bowker, Richard G.
"Observations of Xyleborus affinis Eichhoff (Coleoptera:Curculionidae:Scolytinae) in Central Michigan,"
The Great Lakes Entomologist, vol 48
Available at: https://scholar.valpo.edu/tgle/vol48/iss3/2