Chambers, E.L. 1933 Insects and plant diseases.. Bulletin (Wisconsin Department of Agriculture and Markets) No. 141: 87-129.
Notes: Destruction of forest trees by Scotch pine scale and cottony maple scale mentioned.
Chambers, E.L. 1933 Insects and plant diseases.. Bulletin (Wisconsin Department of Agriculture and Markets) No. 141: 87-129.
Notes: Destruction of forest trees by Scotch pine scale and cottony maple scale mentioned.