198 ILLINOIS STATE ACADEMY OF SCIENCE 



BARBERY ERADICATION IN ILLINOIS. 1 



F. E. Kempton, Pathologist in Charge, G. C. Curran, 

 State Leader, Illinois, E. D. Griffin, Asst. State 

 Leader, Illinois 

 Introduction. 

 Progress of Eradication. 

 Problem of Escaped Barberries in Illinois. 

 The Gurnee Area. 

 The Galena Area. 

 The Ogle County Area. 

 Chemical Eradication. 

 Rust Epidemiology Studies. 



Airplane Studies of the Dissemination of Spores of 

 Puccinia graminis. 



Method Used in Collecting and Examining the 

 Spores. 2 



Results from Series 1 and 2. 

 Results of Series 3. 

 Results of Series 4. 

 Summary. 



INTRODUCTION 



The barberry eradication campaign in Illinois was be- 

 gun in the spring of 1918 as a part of the campaign or- 

 ganized by the United States Department of Agriculture 

 in cooperation with 13 north-central wheat-growing 

 States, namely, Colorado, Illinois, Indiana, Iowa, Michi- 

 gan, Minnesota, Montana, Nebraska, North Dakota, Ohio. 

 South Dakota, Wisconsin, and Wyoming. 



This campaign in the United States followed the severe 

 black rust epidemic in 1916 which produced a shortage of 

 wheat that seriously affected the nation's flour supply 

 during the period of the world war. Through the agita- 

 tion of scientists and the results of preliminary surveys 

 in Minnesota and Iowa, conferences were held in 1917 



1 Office of Cereal Investigations, Bureau of Plant Industry, U. S. De- 

 partment of Agriculture, and the Illinois University, College of Agricul- 

 ture, cooperating. 



2 Thanks are due to S. P. Harter, field assistant, who made observa- 

 tions, counts, and germinations of aeciospores on the exposed slides, 



