Though the extent of plant disease development in 1960 will depend to a large degree on weather conditions, the common diseases of a particular crop usually can be expected to some extent every year. Some recent developments also may have particular importance for this year.
Shurtleff, Malcolm C.
"Plant Disease Outlook for 1960,"
Iowa Farm Science: Vol. 14
, Article 4.
Available at: http://lib.dr.iastate.edu/farmscience/vol14/iss7/4