Making plant disease predictions- like making political forecasts - can be a bit shaky. How severe diseases will be on your farm or in your garden in 1959 depends largely on the amount and frequency of rainfall during teh coming spring and summer months. In cool, wet years, diseases generally are much more important than in warm, dry seasons. But some loss occurs every year.
Shurtleff, Malcolm C.
"Plant Disease Outlook for 1959,"
Iowa Farm Science: Vol. 13
, Article 8.
Available at: https://lib.dr.iastate.edu/farmscience/vol13/iss7/8