CONTENTS. 
Page. 
Historical summary of chinch-bug diseases 7 
Results of experiments for 10 years, 1888 to 1897 10 
Outline of work against the chinch bug carried on in Kansas during 1910 14 
Natural distribution of Sporotrichum in Kansas 16 
Natural presence of Sporotrichum among chinch bugs during hibernation 17 
Natural presence of Sporotrichum in wheat fields and cornfields during the 
spring and summer of 1910 18 
Insects upon which Sporotrichum has been found 20 
Natural distribution of Sporotrichum in the soil and its relation to artificial 
infection 20 
Artificial infection experiments with Sporotrichum in the laboratory 21 
Artificial infection — field experiments , 26 
Mr. L. A. Kenoyer's report of his experiments with Sporotrichum and the 
chinch bug 35 
Remedial measures and conclusions 43 
Bibliography 54 
5 
