CONTENTS. 



Page, 



Introduction ' 



General appearance of the disease - 8 



Theories of the cause and treatment of the disease 9 



Weakness of the plants . .■ 9 



Improper soil conditions 10 



Improper conditions furnished the plants during the growing and flower- 

 ing season 10 



Fungous nature of the disease 10 



Conditions favoring the development and spread of the disease 13 



Susceptiliility of varieties - 1"* 



Preventive measures 1^ 



Explanation of plates 1^ 



5 



