Pulling from my new favorite book, Mineral Nutrition and Plant Disease, Edited by Lawrence E. Datnoff, Wade H. Elmer, and Don Huber. I have pulled out selected text from the book. It's not word for word, but I have tried to keep the original intent intact. I have include my notes in italics to set it apart from the text of the book. I hope you learn as much new information about sulfur as I did.
Chapter 8 Sulfur and Plant Disease
Justus Von Liebig, one of the founders of modern chemical agriculture understood that the nutritional status of plants was a key factor in a plants susceptibility to disease.
SIR is the reinforcement of the natural resistance of plants against fungal pathogens through triggering the stimulation of metabolic processes involving sulfur by targeted sulfate-base and soil applied fertilizer strategies.
(My Note: That was along sentence, what does it mean? Applying sulfur fertilizers reduces the incidence of disease by strengthening the plants natural immune system.)
In trials, as the S supply was increased reductions of the following diseases are noted: