Plant diseases take a yearly toll in reduced vigor, yields and quality of crops. If everyone used the best-known methods of control, this loss could be reduced by approximately 25 percent.
Shurtleff, Malcolm C.
"Plant Disease Outlook for 1958,"
Iowa Farm Science: Vol. 12
, Article 4.
Available at: https://lib.dr.iastate.edu/farmscience/vol12/iss7/4