The influence of disease on crops and trees will be decided by a large number of interacting factors. Most of the diseases responsible for loss and profit in crops can be eliminated by preventive measures you and your neighbors take.
Lambe, R, C, and Epstein, A. H.
"Plant Disease Outcome in 1967,"
Iowa Farm Science: Vol. 21
, Article 8.
Available at: https://lib.dr.iastate.edu/farmscience/vol21/iss7/8