134 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 14 



and there is suspicion of both being present in the same apiary, and pos- 

 sibly even some as mixed infection in the same colony, control of the 

 two diseases will depend upon the elimination of European foulbrood 

 first. This should be done by treating the entire apiary for European 

 foulbrood, by strengthening and requeening all the colonies with young 

 and vigorous Italian queens, which is after all only good beekeeping. 

 After the elimination of European foulbrood it will be a simple matter 

 to determine those colonies that have not responded to this treatment, 

 as being American foulbrood. This method is possible because of the 

 fact that American foulbrood seldom spreads with the rapidity of Euro- 

 pean foulbrood, particularly if care is taken to prevent robbing and mixing 

 up of combs. Those colonies which continue to show American foul- 

 brood remaining may now be given the usual shaking treatment. 



