COTTON BOLL WEEVIL IN THE MISSISSIPPI VALLEY. 27 



Table XXII. — Total developmental 'period of the boll weevil: Observations of 1914. 



Nature of 

 weevils. 



Larval food. 



Period of ovipo- 

 sition. 



s 

 i 



a 



03 

 IS 



'6 



o 



ca 

 S3 

 !> 

 < 



a 



"A 



!> 

 a> 

 <p . 



a 



o 

 ■§ 



<S 



;> 



U4 



a 



a . 

 d-d 



O 



e 



c . 



o 

 Eh 



■6 



;~< 

 i) 

 & 



s 



<U 



First generation . 

 Second genera- 

 tion. 

 Do 



Cotton squares. 

 do 



June 2- July 2 



June23-June30. 



July 1-5 



3 

 2 



11 

 14 

 50 

 104 

 40 

 33 

 16 

 5 



Dys 



44 14. 7 

 31 15. 5 



7 

 3 



18 

 16 

 41 

 92 

 34 

 25 

 26 

 15 



110 

 45 



269 

 230 

 603 

 1,303 

 509 

 375 

 384 

 232 



Days. 

 15.7 

 15 



14.9 



14.4 



14.7 



14.2 



15 



15 



14.8 



15.5 



10 

 5 



29 

 30 

 91 



196 

 74 

 58 

 42 

 20 



154 



76 



439 



430 



1, 356 



2,778 



1,107 



870 



629 



304 



Days. 

 15.4 

 15.2 



do 



17015. 5 

 200 1 14. 3 

 753 15.1 



15.2 



Do 



do 



July 8-12 



July 13-20 



July 21-31 



Aug. 1-5 



Aug. 6-11 



Aug. 12-31 



Sept. 1-15 



14.3 



Do 



do 



14.9 



Do 



do 



1,475 



598 

 495 

 245 



72 



14.1 

 15 

 15 

 15.3 



14.5 



14.2 



Do 



do 



15 



Do 



do 



15 



Do 



do 



15 



Do 



do 



15.2 









Total 



275 



4,039 



279 

 305 

 204 

 208 

 127 



14.7 



14 



14.5 

 14.6 

 14.9 

 14.1 



270 



~17 

 30 

 13 



22 

 11 



3,950 



14.6 



545 



7,989 



14.6+ 





do 



July 15-21 



July 22-26 



July 27-31 



Aug. 2-10 



Aug. 11-24 





Third generation 

 Do . 



20 

 21 

 14 

 14 

 9 



242 

 436 

 187 

 330 

 164 



14.2 



14.5 



14.4 



15 



15 



37 

 51 



27 

 36 

 20 



521 

 741 

 391 

 538 

 291 



14.1 



....do 



14.5 



Do 



do 



14.5 



Do 



Do 



do 



do 



15 

 14.6 









Total 



78 



1,123 



14.4 



93 

 18 

 29 



1,359 



14.6 



171 



2,482 



14.5 





do 



do 



Aug. 2-10 



Aug. 11-23 





Fourth genera- 

 tion. 

 Do 



14 



22 



211 

 312 



15.1 

 14.2 



266 

 416 



14.8 

 14.3 



32 

 51 



477 

 728 



14.9 

 14.3 









Total 



36 



523 



14.5 



47 



682 



14.5 



83 



1,205 



14.5 





do 



Sept. 2-5 





Fifth generation. 



5 



72 



14.5 



6 



86 



14.3 



11 



158 



14.4 



Total 



397 



5,801 



14.6 



423 



6,187 



14.6 



820 



11,988 



14.6 











During the entire season 397 males and 423 females were bred. 

 The average developmental period for both sexes was 14.6 days. 

 Weevils bred later than September required a much longer develop- 

 mental period but no positive record was kept of these weevils. 



Observations of 1915. — The total developmental periods of all 

 weevils observed during: 1915 is detailed in Table XXIII. 



