I have received numerous queries about certain diseases of plants that it may not be out of place at this time to briefly describe a few and make some suggestions as to their probable cause, and prevention.
The season has been an unusual one both in regard to precipitation and temperature, and this perhaps accounts for the severity of some diseases. The subject of fungus diseases of plants is no doubt closely connected with certain conditions of soil and atmosphere,but it is very evident that these are not the only causes at work. Practical farmers have long learned by experience that warm, sultry weather accompanied by rain is conducive to the production of rust.
Pammel, L. H.
"Some diseases of plants common to Iowa cereals,"
Bulletin: Vol. 2
, Article 5.
Available at: https://lib.dr.iastate.edu/bulletin/vol2/iss18/5