Residues of soil insecticides found in milk and soybeans affect recommendations for 1966. Western corn rootworm continues spread. Southern corn rootworm and black cutworm did serious damage in 1965.
Gunderson, Harold and Stockdale, H. J.
"Insect and Insect Control in 1966,"
Iowa Farm Science: Vol. 20
, Article 10.
Available at: https://lib.dr.iastate.edu/farmscience/vol20/iss7/10