COTTON BOLL WEEVIL IN THE MISSISSIPPI VALLEY. 



17 



Table VIII. — Fecundity of first-generation females of Anthonomus grandis on cotton 



squares. 





Date ovi- 

 position 

 began. 



Date ovi- 

 position 

 ended. 



Oviposi- 



tion 

 period. 



Eggs deposited. 



Date female emerged. 



Total. 



rer day. 



Maxi- 

 mum per 



day. 



June 20 



June 26 

 ...do 



Sept. 7 

 Aug. 4 

 Aug. 29 

 July 28 

 July 20 

 July 14 

 Aug. 15 

 Aug. 25 

 Aug. 27 

 Aug. 31 

 Aug. 20 

 July 28 

 Aug. 23 



Days. 

 74 

 40 

 62 

 31 

 25 

 19 

 -54 

 66 

 62 

 65 

 62 

 33 

 59 



198 

 197 

 91 

 57 

 89 

 66 

 191 

 160 

 142 

 107 

 111 

 110 

 204 



2.5 



4.93 



1.5 



1.8 



3.7 



3.5 



3.5 



2.4 



2.3 



1.6 



1.8 



3.3 



3.5 



8 



Do 



10 



Do.... 



June 29 



June 28 



June 26 



do 





Do 



5 



June 21 



9 



Do. 



11 



Do 



June 23 

 June 27 

 ...do 



8 



Do 



8 



Do 



12 



Do .... 



June 28 



June 26 



do 



6 



Do 



6 



Do.. 





Do . . ... 



-do .. 



10 









Total . . 



650 

 50 

 74 

 19 



1,723 

 132. 5 

 204 

 57 







Average. . . . 







2.7 

 4.9 

 1.5 











12 



Minimum 







5 











The total number of eggs deposited by each female ranged from 

 57 to 204 with an average of 132.5. The average number of eggs 

 per female per day was 2.7 and the maximum was 12. The oviposi- 

 tion period varied from 19 to 74 days with an average of 50 days. 



Fecundity of second generation grandis females. — Five pairs of 

 weevils emerging from the first generation series were mated and 

 placed with cotton squares during the last of July and the first of 

 August (Table IX.) 



Table IX.- 



'Fecundity of second-generation females of Anthonomus grandis on cotton 

 squares. 



Date female emerged. 



Date 

 ovipo- 

 sition 

 began. 



Date 

 ovipo- 

 sition 

 ended. 



Ovipo- 

 sition 

 period. 



Eggs deposited. 



Total. 



Per day. 



Maxi- 

 mum per 



day. 



July 16. . 

 Aug. 13. 

 July 16. 

 July 29. 

 Aug. 9.. 



Total. 



Average 



Maximum . . 

 Minimum.. 



July 23 

 Aug. 18 

 July 27 

 Aug. 2 

 Aug. 17 



July 29 



Sept. 4 



Sept. 5 

 Aug. 28 



Days. 

 7 

 18 

 40 

 35 

 13 



13 

 42 

 93 

 175 

 24 



113 

 22. 

 40 



7 



347 



69.4 

 175 



13 



1.9 

 2.3 

 2.3 

 5.0 

 L6 



3.1 



5.0 

 1.6 



The total number of eggs per female ranged from 13 to 175 with an 

 average of 69.4. The number of eggs per female per day varied from 

 1.6 to 5.0 and the maximum number was 10. The oviposition period 

 ranged from 7 to 40 days with an average of 22.6 days. 



