THE GBAXARY WEEVIL 
17 
DAILY RATE OF OVTPOSITION 
Xo data on the daily rate of oviposition of granary weevils of 
known age have ever been published. Straehov-Koltehin {65), after 
working with weevils of unknown ages and counting the adults 
emerging from kernels of grain with which they had been confined, 
published data from which he concluded that, when the average 
moisture content of the grain was from 15 to 17 per cent, a single egg 
is deposited at intervals of a few days at a temperature range of 
59° to 65.5° F., one egg daily at 63.5° to 70° F., one to two eggs daily 
at 70° to 75° F., and two to'three eggs daily at 75° to 82° F. As this 
author did not take into consideration the mortality among the 
immature stages, it is surprising how closely his data agree with 
those given in Table 3 based upon an actual count i of the eggs 
laid daily by females of known ages. 
Table 3. — Daily rate of oviposition of the granary weevil ' b > e 
Date of 
oviposition 
Weevil num 
ber and oviposition record 
Daily 
mean 
tem- 
pera- 
ture 
1 2 3 
4 
5 6 
7 S 9 10 
11 
12 
13 
14 
1.5 
16 
;: 
18 
19 
20 
21 
22 
23 
24 
1921 
2 
... 
F. 
78 
16 
77 
17 
79 
18 1 
j 
82 
19 1 
75 
20 
73 
21 
~2 
75 
22 1 
76 
23 
75 
S.„::._::._L. 
73 
25 1 
75 
26 
71 
27 
69 
28 
29 ... 
2 
... 
1 

...... 
74 
78 
30 
1 
76 
Oct 1 
1 

68 
2 
67 
3 
68 
4 
66 
1922 
Jan. 28.. 
2 
I 
1 
1 
71 
30 
"i 
"i 
i 
~~i 
1 
1 
1 
2 
1 
1 
l 
i 
61 
31. 
1 
1 
... 
1 
1 
"l 
1 
2 
~~2 
"I 
~2 
2 
"2 
"I 
1 
Feb. 1 
1 
1 
~~2 
1 
~"i 
2 
1 
1 
1 
1 
1 
1 
"i 
i 
i 
~~i 
l 
2 
1 
"~2 
1 
1 
i 
2 
1 
2 
1 
1 
3 
1 
1 
1 
2 
1 
1 
~~2 
3 
"i 
i 
i 
i 
1 
1 
1 
_ 
1 
2 
1 
1 
2 
3 
2 
1 
1 
1 
3 
1 
1 
1 
1 
1 
1 
2 
2 
1 
2 
2 
69 
2.. 
1 
70 
3 
- 
1 
2 
1 
1 
"i 
2 
"i 
i 
i 
2 
2 
1 
1 
3 
1 
3 
2 
1 
"i 
1 
"\ 
1 
1 
63 
4. 
i 
65 
5 
64 
6 
I 
i 
... 
61 
7 
67 
8 
1 
1 
2 
i 
68 
9 
68 
10 
1 
2 
1 
69 
11_ 
i 
i 
i 
2 
"i 
... 
68 
12 
68 
13... 
2 
1 
::: 
1 
1 
2 
1 
1 
1 
1 
"i 
"2 
1 
"2 
"l 
i 
i 
61 
14 
66 
15 
2 
1 
1 
... 1 
3 3 
65 
16 
1 
1 
69 
17 
18 
1 
2 
1 
i 
65 
° Xo eges were laid on dates omitted. 
b Weevils emereed as adults as follows: Nos. 1 to 3 on Sept. 5, Xos. 4 and 5 on Sept. 6, Xo. 6 on Sept. 7. 
Xos. 7 to 10 on Xov. 7 and 8, and Xos. 11 to 24 on Oct. 25. 1921. 
c Xos. 1, 2, 3, 4, 5. 6. 7, 8, 9, 11, 12, 13, 14, 15, 16. 17. 18, 19. 20, 21. 22, 23. and 24 of Table 3 are the same 
females recorded in Table 2 as Xos. 12, 13, 14, 15, 16, 17, 32, 33, 34, 18, 19, 20, 21. 22, 23, 24, 25, 26, 27, 28, 2% 
30, and 31, respectively. 
* Two kernels of corn were inclosed with a pair of weevils and removed daily and examined beneath the 
binocular microscope. 
72238°— 26- 
