﻿20 BULLETIN 1393, IJ. S. DEPAETMENT OE AGEICIJLTURE: 



Table 3. — Daily rate of oviposition of the granary weevil — Continued 



Date of 

 oviposition 



Weevil number and oviposition record 



Daily 

 moan 



1 



2 



3 



4 



5 



6 



7 



8 



9 



10 



11 



12 



13 



14 



IS 



16 



17 



18 



19 



20 



21 



22 



23 



24 



tem- 

 pera- 

 ture 



1922 

 July 25 















2 

 1 



































p 



80 



26 

















































75 



27 

















— 



— 











1 

 1 





















77 



28 









































81 



29 















































79 



30 

















— 



— 

























1 



— 



— 



79 



31 





































77 



Aug. 1 . . - 

















































78 



2 











































1 



— 







77 



4 











































77 



6 

















1 

































80 



8 

















































78 



9 

















































72 



23 

















































75 



25 

















































76 



Sept. 1 

















































76 



3 

















































75 



5 

















































80 



9 

















































77 



10 

















































78 



14 . _. 

















































74 



15 

















































77 



17 

















































70 



19 

















































68 



20 

















































69 



23 

















































70 



24 

















































73 





65 



71 



145 



128 



130 



98 



130 



242 







1 



























Total eggs.-- 



78 



108 



197 



30135 



1 



126 



234 



181 



184 



74 



114 



200 



177166 



210 



95 





During the experiments recorded in Table 3 the average moisture 

 content of the grain (corn) was about 12 to 14 per cent. It will be 

 noted that from one to five eggs were laid per day when oviposition 

 took place; 58.4 per cent of the 2,199 records of oviposition were for 

 one egg per day, 33.4 per cent for two eggs per day, 7 per cent for 

 three eggs per day, 0.9 per cent for four eggs per day, and 0.3 per 

 cent for five eggs per day. On the 5 days when five eggs per day 

 were laid the mean temperatures were 70°, 70°, 68°, 69°, and 75° F, 

 and not more than two of the females under observation deposited 

 so large a number of eggs on any one day. On the 19 days when 

 four eggs were deposited each day, the mean temperatures were 70°, 

 67°, 69°, 65°, 64°, 67°, 67°, 68°, 70°, 70°, 70°, 66°, 66°, 70°, 70°, 

 70°, 68°, 80°, and 67° F. The more usual number of eggs deposited 

 per day appears to be one or two. In one instance when the mean 

 temperature fell as low as 58° F., 6 females deposited one egg each, 

 16 females deposited two eggs each, and 1 female deported three 

 eggs. When these records were made (April 2) the female weevils 

 were in the midst of spring activity. Earlier in the year, on February 

 20, when the mean temperature was 58° F., but at the beginning 

 of spring oviposition, 9 females deposited one egg each and only 1 

 female two eggs. One female. No. 20, on two occasions deposited 

 three eggs for four consecutive days when the temperature means 

 were 69°, 66°, 68°, and 67° F., and 75°, 74°, 75°, and 74° F. It is 

 interesting to note, however, that during the latter period of four 

 days when a second female (No. 3) also deposited three eggs each 

 day, other records show but one egg deposited in 32 instances, two 

 eggs in 19 instances, and three eggs in only 1 instance. A female, 

 No. 11, deposited only a single egg per day on the 39 oviposition 



