NOSEMA-DISEASE. 17 



Table III. — Results obtained in 1913 from a study of Nosema infection in an apiary.^ 



Colony No. 



Ex- 

 peri- 

 ment. 

 No. 1. 



March. 



May. 



June. 



July. 



Ex- 

 peri- 

 ment. 

 No. 2. 



August. 



Sep- 

 tem- 

 ber. 



October. 



Per 



cent. 





12. 



25. 



29. 



3. 



18. 



14. 



16. 



19. 



22. 



9. 



25. 



23. 



13. 



18. 



28. 





1 







0= 

 0" 

 0= 

 0» 

 Oe 

 8f 

 0= 























! 









2 











le 



Ip 

 ip 

 0» 





Op 









Oe 











2 



5 











Op 









ip 



2p 









5 



7 





























10 



8 















l" 

















3 



12 



2 



4« 



D 

























60 



20 





Oe 













0= 



2« 











5 



30 







R 

 R 

 Op 

























31 



































35 



4 



6« 





'6p' 

 OP 



0= 

 0« 



l" 



3» 







1 = 



■■'a' 



0= 



0» 











16 



36 







6p 

 Ip 

 2p 

 2p 







0= 



20 



48 











0« 







1« 



!<• 

 0= 









6 



49 











0» 













8 



50 













1« 





B 









7 



55 



6 



0= 



3' 











61 















C 



0" 

 1" 

 2» 

 1« 

 0« 



0=' 



'6»' 



9p 







0« 



30 



65 



7 



2e 





0« 





OP 



IP 



1» 



6«' 



3° 

 Op 

 O" 

 0" 

 0» 

 0« 













6 



66 



1« 







D 



'"e" 



2p 







0« 



12 



67 



8 



0= 



6»' 

 o« 



2e 

 0» 



0" 

 0» 



1' 



Oe 



= 







21^ 







4 



68 





Op 







3p 

 Ip 



O" 







10 













1- 











5 



70 



10 



0« 



4 = 





OP 



le 



0» 

 O" 





1« 

 5^ 





le 

 = 











11 



72 







0« 











10 



73 















Op 













75 

































79 











1« 









1» 





Oe 









6 



81 

























82 





















F 



= 

 1« 



'6»' 



Ip 



2p 

 3p 







09 



3 









! 





Op 

 Op 





0« 











6 



b 







1 





0' 













10 









1 















o« 



Oo 











d 

























4« 

 4p 









20 









1 







1« 

















25 









1 







1 





" 















1 AVhere the number of bees examined is small, thp rate indicating the percentage frequently is not given. 



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

 ined m 1913 that were examined in 1912 bear the same numbers in Table III as in Table II. 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; colonies in experiment No. 2, by capital letters. 



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

 bees examined from the 25 colonies then in the apiary 28 (10 per cent) 

 were found to be Nosema infected. 



During June bees were examined from 21 colonies, and 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 examined and out of 240 

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



During September, 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 found 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 



