COTTON BOLL WEEVIL IN THE MISSISSIPPI VALLEY. 27 



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









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OT 



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T3 

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Nature o f 

 weevils. 



Larval food. 



Period of ovipo- 

 sition. 



-d 



r 





ft 



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 M 

 o3 





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 s 





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£ 



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H 



Eh . 



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Dys 







Days. 







Days. 



First generation. 

 Second genera- 



Cotton squares. 



June 2- July 2 



3 



44 



14.7 



7 



110 



15.7 



10 



154 



15.4 



do 



June 23-June 30 . 



2 



31 



15.5 



3 



45 



15 



5 



76 



15.2 



tion. 

























Do 



do 



July 1-5 



11 

 14 



50 



170 

 200 

 753 



15.5 

 14.3 

 15.1 



18 

 16 

 41 



269 

 230 

 603 



14.9 

 14.4 

 14.7 



29 

 30 

 91 



439 



430 



1,356 



15.2 



Do 



do 



July 8-12 



July 13-20 



14.3 



Do 



do 



14.9 



Do 



do 



July 21-31 



.104 



1,475 



14.1 



92 



1,303 



14.2 



196 



2,778 



14.2 



Do 



do 



Aug. 1-5 



40 



598 



15 



34 



509 



15 



74 



1,107 



15 



Do 



do 



Aug. 6-11 



33 



495 



15 



25 



375 



15 



58 



870 



15 



Do 



do 



Aug. 12-31 



16 



245 



15. 3 



26 



384 



14.8 



42 



629 



15 



Do 



do 



Sept. 1-15 



5 



72 



14.5 



15 



232 



15.5 



20 



304 



15.2 



Total 



275 



4,039 



14.7 



270 



3,950 



14.6 



545 



7,989 



14.6+ 





do 



July 15-21 





Third generation 



20 



279 



14 



17 



242 



14.2 



37 



521 



14.1 



Do. 



do 



July 22-26 



21 



305 



14.5 



30 



436 



14.5 



51 



741 



14.5 



Do 



do 



July 27-31 



14 



204 



14.6 



13 



187 



14.4 



27 



391 



14.5 



Do. 



do 



Aug. 2-10 



14 



208 



14.9 



22 



330 



15 



36 



538 



15 



Do 



do 



Aug. 11-24 



. 9 



127 



14.1 



11 



164 



15 



20 



291 



14.6 



Total 



78 



1,123 



14.4 



93 



1,359 



14.6 



171 



2,482 



14.5 





do 



Aug. 2-10 





Fourth genera- 



14 



211 



15.1 



18 



266 



14.8 



32 



477 



14.9 



tion. 

























Do 



do 



Aug. 11-23 



22 



312 



14.2 



29 



416 



14.3 



51 



728 



14.3 



Total 



36 

 5 



523 



14.5 

 14.5 



47 

 6 



682 



14.5 



83 



1,205 

 158 



14.5 





..'...do 



Sept. 2-5 





Fifth generation. 



72 



86 



14.3 



11 



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. 



