A Preliminary Report on the Occurrence and Distribution of the Common Bacterial and Fungous Diseases of Crop Plants in Illinois

Abstract

The next important step in the study of plant diseases is concerned with epidemiology—the fluctuation in severity and abundance from year to year exhibited by all diseases. An explanation of the causes underlying these fluctuations promises things of the greatest importance to the growers of our crops in the improvement of control measures and the regulation of times and methods of their application.