Weather conditions during the growing season pretty much determine the size of the insect problem in any given year. Keeping this in mind, here are the prospects for 1960- depending on the weather.
Gunderson, Harold and Raun, Earle S.
"Insect and Rodent Prospects for 1960,"
Iowa Farm Science: Vol. 14
, Article 7.
Available at: http://lib.dr.iastate.edu/farmscience/vol14/iss7/7