UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 810 



Contribution from the Bureau of Entomology 

 L. O. HOWARD. Cliief 



Washington, D. C. 



PROFESSIONAL PAPER 



February 26, 1920 



EUROPEAN FOULBROOD 



By 



G. F. WHITE, Specialist in Insect Diseases 



CONTENTS 



Page 



Introduction 1 



Name of the Disease 2 



Healthy Larvae of the Age at which they 



Die of European Foulbrood .... 3 



Symptoms 4 



Etiology 7 



Technique 15 



Thermal Death Point of Bacillus pinton 17 



Resistance of Bacillus pluton to Drying . 17 

 Resistance of Bacillus pluton when Dry 



to Direct Sunlight 19 



Resistance of Bacillus pluton in Water to 



Direct Sunlight 20 



Resistance of Bacillus pluton in Honey to 



Direct Sunlight 21 



Page 

 Resistance of Bacillus pluton to Fermen* 



tation 21 



Resistance of Bacillus pluton to Putrefac- 

 tion 



Viability of Bacillus pluton in Honey . . 

 Viability of Bacillus pluton in Pollen . . 

 Resistance of BacUlus pluton to Carbolic 



Acid 



Effect of Drugs on European Foulbrood 

 Transmission of European FOulbrood . 



Diagnosis 28 



Prognosis 31 



Summary and Conclusions ..... 31 



Literature Cited 34 



Explanation of Plates 37 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1920 



