12 Wisconsin Bulletin 333 



Where the honey from these cells is fed to the bees, a new 

 infection is started which soon spreads to other parts of the 



brood nest. t,u a 



In an experiment made in 1919, eight sets of brood 

 free" dry extracting combs taken from colonies diseased with 

 American foulbrood were given to eight two-pound packages 

 of bees. Sugar syrup was fed to these so that they had abund- 

 ance of stores up to the time of the honey flow. 



In six of these, disease did not appear at all during the sea- 

 son. In two others the disease appeared with the first set of j 

 brood and continued to increase until the colonies were treated 

 in July. While only two of the colonies became diseased, the; 

 amount of disease carried was 25 per cent. Such a high per-: 

 centage makes the use of dry extracting combs very dangerous.s 



FIG. 4.— AMERICAN FOULBROOD .CAUSED A HEAVY LOSS IN 

 THIS AJ»IART 



In 1918 an average of 187 pounds of honey per colony was produced 

 here. In 1919 nearly every colony was diseased and almost cleaned out 

 due to the introduction of the disease in ^he fall of 1918. 



Five sets of frames with foundation which had been worked 

 on but slightly or not at all were also taken from diseased colonies 

 of the year before and given to package bees. Siigar syrup 

 was fed to these colonies until the honey flow began. No dis- 

 ease appeared in any of these colonies., 



Does Scorching Insure Complete Disinfection? 



Bees do not leave honey scattered about on the walls of the 

 hive or on frames and will immediately gather up the smallest 



