Pettit, R.H. 1928 Report of the Section of Entomology.. Experiment Station Reports (Michigan State Board of Agriculture) 188-200.
Notes: Scale species reported include Physokermes piceae, Chionaspis pinifoliae, C. americana and Gossyparia spuria.
Pettit, R.H. 1928 Report of the Section of Entomology.. Experiment Station Reports (Michigan State Board of Agriculture) 188-200.
Notes: Scale species reported include Physokermes piceae, Chionaspis pinifoliae, C. americana and Gossyparia spuria.