UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 810 



Contrlbntlon from the Barean of Entomolosy 

 L. O. HOWARD. Chief 



Washington, D.G. 



PROFESSIONAL PAPER 



February 26, 1920 



EUROPEAN FOULBROOD 



By 



G. F. WHITE, Specialist in Insect Diseases 



CONTENTS 



Pago 



Introdnctlon 1 



Name of the Disease 2 



Healthy Larvae of the Age at which they 



Dieof EnropeanFonlbrood .... 3 



Symptoms 4 



Etlolocy 7 



Technique IS 



Theimal Death Point of Baciilas pioton 17 



Resistance of Barillas piston to Drying . 17 

 Resistance of Bacillus piuton when Dry 



to Direct Sunlight 19 



Resistance of BacIUns pinton in Water to 



Direct Sunlight .... ^ ... . 20 

 Resistance of BaeHlns pinton !n Honey to 



Direct Sunlight 21 



Page 

 Resistance of Baciiiua pinton to Fermen- 

 tation 21 



Resistance of Bacillus piuton to Putrefac- 

 tion 22 



Viability of Bacillus pinton in Honey . . 23 



Viability of Bacillus pinton in Pollen . . 24 

 Resistance of Baciilas pinton to Carbolic 



Acid '. 24 



Eifect of Drugs on European Foulbrood 29 



Transmission of European Foulbrood . 26 



Diagnosis 28 



Prognosis 31 



Summary and Conclusions 81 



Literature Cited 84 



Explanation of Platea 87 



WASHINGTON 

 GOTERNMENT PBlNTINa OVFICB 



1920 



