20 BULLETIN 780, IT. S. DEPARTMENT OF AGRICULTURE. 
Table Y— Summary of results from a study of Nosema infection in an apiary. 
March. 
April. 
May. 
June. 
July. 
73 
•d 
73 
73 
Year. 
I 
o 
-a 
© 
I 
© 
1 
73 
© 
© 
73 ' ® I 
© 1 -g ' 
I 
a 
1 
* 
1 
•a 
fl 
a 
fl 
S 
X 
© 
© 
© 
S3 
a 
© 
s 
c 
I* 
© 
03 
X 
© 
8 
© 
C3 
a 
© 
8 
c3 
X 
© 
8 
OS 
a 
© 
8 
O 
03 
© 
03 
a 
© 
8 
1 
O 
(4 
03 
X 
© 
S 
03 
1 
8 
"3 
© 
© 
pq 
!4 
Ph 
pq 
y A 
Ph 
pq 
53 
Ph 
pq 
A 
Ph 
pq 
£ 
Ph 
1912 
?40 
72 
sn 
410 
96 
93 
130 
19 
15 
130 
260 
240 
1913 
270 
?8 
10 
50 
7 
220 
g 
23 
2 
9 
1 
1914 
1,050 
166 
Ifi 
700 
60 
9 
1915 
50 
6 
12 
280 
24 
9 
200 
16 
8 
Total 
320 
34 
11 
520 
96 
IS 
1,910 
285 
17 
1,050 
87 
8 | 630 46 
7 
August. 
September. 
October 
73 
73 
■2 
a 
q 
73 
73 
•^ 
a 
73 
73 
73 
5 
03 
Year. 
C 
1 
a 
§ 
s 
© 
R 
1 
a 

1 
•a 
1 
a 
Kl 
© 
© 
x 
a 
X 
a 
M 
a 
J2 
£ 
a 
© 
8 
8 
In 
© 
3 
a 
© 
© 
© 
8 
a 
© 
8 
"3 

"3 

8 
pq 
fc 
Oh 
pq 
fc 
Ph 
P5 
A 
Ph 
Eh 
H 
1912 
60 
240 
14 
11 
170 
170 
14 
43 
8 
25 
1,140 
1,270 
236 
228 
?n 
1913 
5 
60 
1 
10 
1914 
220 
2.210 
530 
121 
46 
10 
q 
Total 
300 
25 
8 
560 
57 
in 
fin 
1 
5,150 
631 
1? 
.From Table V it will be observed that the number of infected 
bees found at different periods of the year varied considerably. 
April and May furnished the highest percentage, being 18 and 17 
per cent respectively. In March, June, July, August, and Sep- 
tember the number of Nosema-infected bees among those examined 
was 11, 8, 7, 5, and 10 per cent respectively. Out of 5,150 bees 
taken from the apiary from April, 1912, to June, 1915, and exam- 
ined, 631 (12 per cent) were Nosema infected. 1 
Laidlow (1911) reports that out of somewhat more than 1,500 
bees received from various parts of Australia, 17 per cent were 
found to be Nosema infected. 
From an examination of the foregoing tables it is seen that Nosema 
infection was found to be present in practically every colony of the 
apiary. Had further examinations been made of the few colonies 
in which Nosema apis was not found, one could well expect, from 
what is known of the disease, that these, too, would have revealed 
the presence of the infection. It is seen also that the infection 
persisted throughout all seasons of the year, and that it was heaviest 
1 While this three-year study was being made the apiary served for other work. It is likely that the 
attending manipulations were accompanied from time to time by a certain amount of robbing. From the 
nature of the disease, however, it is not behoved that this fact affected materially the results obtained. 
