Epidemic Diseases of Grain Crops in Illinois, 1922-1926

The Measurement of Their Prevalence and Destructiveness and An Interpretation of Weather Relations Based on Wheat Leaf Rust Data

Abstract

The detailed account given in these pages of the means used to measure diseases, of the methods by which the data are analysed, and of the results obtained, is confined to the diseases of cereals. It is presented, not merely because it follows so directly the task accomplished by the first report, nor yet because it represents the first intimate and extensive study of crop diseases growing naturally in Illinois fields, but especially because it will enable the grower of crops to understand, better than he
ever has, the destructive effect of diseases which he all too often ignores.