NOSEMA-DISBASE. 



17 



Table III. — Results obtained in 1913 fiom a study of Nosema infection in an apiasyJ 



> Where the number of bees examined is small, the rate indicating the percentage frequently is not given. 



Explanation for Table III.— The method of recording results is the same as in Table ll. Colonies exam- 

 ined m 1913 tmit were examined in 1912 bear the same numbers in Table III as in Table U. Colonies repre- 

 senting the increase in the spring are designated by the letters "a" to "e," inclusive. ;Colonies in experi- 

 ment No. 1 are indicated by numbers; col(^es in experiment No. 2, by capital letters. 



From Table III it will' be observed that in March, 1913, out of 270 

 bees examiaedfrom the 25;fcoloiiies then in the apiary 28 (10 per cent) 

 were found to be Nosema infected. , 



During June bees were exainined from 21 colonies, ajnd out of 220 

 bees 8 (4 per cent) were found to be infected. \ 



During July 21 colonies were examined and out of 260 bees 23 (9 

 per cent) were found to be infected. 



During August bees from 18 colonies were exainined and out of 240 

 bees 11 (5 per cent) were found to be infected.. 



During Septeni,ber, out of 170 bees from 17 colonies 43 (25 per; 

 cent) were found to be infected. . 



During October bees were examined from 6 colonies only, and out of 

 60 bees 1 (2 per cent) was fojund to be infected. 



Out of a total of 1,270 bees examined during the year 1913, 121, 

 (10 per cent) were infected,; being less than the percentage found in 

 1912, which was 20 per cent. The spring infection was very much 

 less in 1913 than in 1912. 



103789°— 19— Bull. 780 3 



