﻿THE GEANARY WEEVIL 



17 



DAILY RATE OF OVIPOSITION 



No data on the daily rate of oviposition of granary weevils of 

 known age have ever been published. Strachov-Koltchin {65), after 

 working with weevils of unknowni 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 

 inunature stages, it is surprising how closely his data agree with 

 those given in Table 3 based upon an actual count * of the eggs 

 laid daily by females of known ages. 



Table 3. — Daily rate of oviposition of the granary weevil "• ^< 



Date of 



Weevil number and oviposition record 



Daily 

 mean 



oviposition 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



16 



17 



18 



19 



20 



21 



22 



23 



24 



pera- 

 ture 



1921 

 Sept 15 







2 



1 











































p 



78 



16 













































77 



17 ^ 













































79 



18 



1 



"i 









































82 



19 









































75 



20 











































73 



21 







1 



2 



1 

 1 



3 









































75 



22 



1 



— 









































76 



23 









































75 



24 















































73 



25 



1 



— 









































75 



26 



— 













— 





... 



... 



... 





... 



... 



... 



— 



— 



— 





71 



27 









69 



28 



29 



2 



.... 









... 



















... 



... 



... 



... 





... 



... 



74 

 78 



30— 



1 













76 



Oct. 1 --- 







1 









































68 



2 















































67 



3 

















































68 



4 

















































66 



1922 

 Jan. 28 





















1 

 I 

 1 

 1 





























71 



30 























""i 



"J 



1 

 1 

 ] 

 2 

 1 

 1 

 1 

 1 























61 



31 



































1 



1 



... 





1 



2 

 "2 

 "\ 



"2 

 1 

 2 



"2 



'i 

 1 



75 



Feb. 1 



2 



— 



... 



— 



... 



— 



"l 





... 



— 



... 



1 

 1 



"2 

 1 



"] 

 2 



1 



1 

 1 



1 

 1 

 1 



"i 



1 



! 

 1 



"i 

 1 



2 



T 



"i 



1 

 1 



"2 

 1 



"\ 



1 

 1 

 I 



1 

 1 

 1 

 2 

 1 

 2 

 1 

 1 

 2 

 3 

 2 

 ! 

 1 

 1 



3 

 1 

 1 



1 

 1 

 1 

 2 

 2 

 1 

 2 

 2 

 1 



I 

 "2 



69 

 70 



3 





















2 



J 



2 

 1 

 1 



"i 



2 



"i 



-j 



1 



"i 

 1 



"i 



1 

 1 



2 

 2 

 1 

 1 



3 

 1 

 3 

 1 

 1 



"'a 



3 



63 



4 













1 











65 



5 













64 



6 





















1 



1 



... 



61 



7 . ... 























67 



8 























1 

 1 

 2 



1 



... 



... 



68 



9 























68 



10 













1 











'i 



1 

 1 



2 



... 



I 



69 



11 





















68 



12 

























68 



13 













2 











1 



J 

 2 

 1 

 1 





1 

 1 



2 

 1 

 1 

 1 



J 



61 



14 . 





















60 



16 























] 



"2 

 1 



2 

 1 

 1 

 1 



(!5 



16 













1 

 1 











1 

 "2 



" 



69 



17 





















67 



18 







... 









1 



... 





...1 1 



65 



• N'o ftRgra wcrp laifl on datos om'ttnd. 



' Weevils omcrpod ns adults a,s follows; Nos. I to '■'. on Sept. 5, Nos. 4 and 5 on Hopt. 6, No. on Sopt. 7, 

 Nos. 7 to 10 on Nov. 7 and 8, and Nos. 1 1 to 24 nti Oft , 25, 1921 . 



<: Nos. 1, 2, 3, 4, 5, 6, 7, .S, 9, II, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, and 24 of Tiiblo 3 nrc the same 

 ffmaiRS rp.corded in Table 2 as Nos. 12, 13, 14, 15, 16, 17, 32, 33, 34, 18, 19, 20, 21, 22, 2,3, 24, 25, 26, 27, 28, 29, 

 30, and 31, respectively. 



• Two kf-rnels of corn were inclosed with a pair of W(«vll8 and rciruovi.'d daily and eximiined Ixaic.atli llio 

 binc'MjIar mirTosfope, 



72238°— 26 3 



