About a million acres of corn and 500,000 acres of small grain and flax were sprayed with 2,4-D in Iowa last season. County extension directors report an estimated 62,000 miles of fencerows were so treated. Chemical manufacturers sold between 500,000 and 800,000 pounds of actual 2,4-D last year.
Sylwester, E. P.; Bakke, A. L.; and Staniforth, David W.
"Another Year of 2,4-D,"
Iowa Farm Science: Vol. 3
, Article 6.
Available at: https://lib.dr.iastate.edu/farmscience/vol3/iss9/6