Damage from soil insects isn't consistent from year to year. Neither, therefore, is the need for treating corn·land with soil insecticides. Yet, use of these materials has consistently increased each year. Why?
"Why Use Soil Insecticides?,"
Iowa Farm Science: Vol. 15
, Article 7.
Available at: http://lib.dr.iastate.edu/farmscience/vol15/iss8/7