10 Department Circular 287, U. S. Dept. of Agriculture. 



serious disease of adult bees in the United States, justified the De- 

 partment of Agriculture in indorsing the bill before Congress and 

 in taking every possible means to prevent the introduction of the 

 disease into the country. The results of the examinations of adult 

 bees in 1921 have been published (46) . 



The work of the season of 1922 in the search for the mite causing 

 the Isle of Wight disease was done chiefly by L. M. Bertholf, under 

 the supervision of A. P. Sturtevant. Beekeepers were again invited 

 to send to the laboratory any adult bees which showed any abnor- 

 mality whatever, and as a result 183 specimens were received for 

 examination. During the season the beekeeping literature of this 

 country and the correspondence of the bureau failed to record any 

 instances of any disease or abnormality of adult bees of any moment, 

 and this probably is the reason for the relatively small number of 

 bees submitted for examination. As was the case during the season 

 of 1921, the specimens were from widely distributed locations in the 

 United States, which adds greatly to their value as evidence of the 

 absence of the disease. The following table, prepared by Dr. Sturte- 

 vant, shows the results of the examinations made in 1922 : 



Table 1. — Results of examinations of adult bees, 1922. 



1 2 of these arsenic and Nosema. 



3 Also Nosema. 



8 10 arsenic; 3 arsenic and Nosema; 4 doubtful arsenic. 



