Many Iowa farmers used some form of DDT to control the "the borer" last season. There were some differences in the control measures used and in the results obtained.
Raun, Earle S. and Blickenstaff, C. C.
"Fight Borers by Land or by Air,"
Iowa Farm Science: Vol. 3
, Article 4.
Available at: https://lib.dr.iastate.edu/farmscience/vol3/iss8/4