COTTON BOLL WEEVIL IN THE MISSISSIPPI VALLEY. 

 Table II. — Duration of life of boll weevils. Observations of 1915. 



VARIETY GRANDIS WITHOUT NORMAL FOOD. 





Substance pro- 

 vided. 



Males. 



Females. 



Both 



sexes. 





Date. 



cd 



B 



en 



>> 

 03 



"> 

 <D 

 CD 



& 



PI 

 O . 



^£> 



® 



> 

 < 



ai 



S ® 

 •a tx 



X 

 03 



cd 



a 



> 

 CD 



CD 



> 



CO 



60 



B 

 o . 



®>> 



S-( 

 CD 



I 



a£ 

 a'§ 



.5 to 



X 



03 



3 



ai 



it 



03 



> 



CD 



to 



R 



o . 



"» >1 



hO-~ 



03 



CD 



Notes on weevils. 





No food 



54 



30 



20 

 12 

 20 



148 



162 



40 

 27 

 63 



Days. 

 2.77 



5.4 



2.0 

 2.25 

 3.15 



Dys 

 40 



10 



6 

 3 

 10 



9 



30 



20 

 12 

 20 



36 



167 



48 

 33 

 69 



Days. 

 4.0 



5.57 



2.4 



2.75 



3.45 



15 



11 



5 

 3 

 10 



Dys 

 40 



11 



6 

 3 

 10 



Days. 

 2.9 



5.48 



2.20 

 2.50 

 3.30 



Hibernated wee- 



June 8 



June 29 



Sept. 8 



do 



do 



do 



vils. 

 Collected in field. 



Hibernated. 

 Bred. 

 Do. 



Aug. 13 



do 



without food 



Young okra fruit 

 .....do 



Do. 



Total 



136 



440 



3.24 



40 



6 



12 

 11 



17 

 15 

 18 

 39 



91 



353 



3.88 



15 



40 



3.49 





July 2 



July 22 



6 



11 

 9 



10 



8 



14 



12 



7 



32 



4 



40 



22 



48 

 72 



75 



60 



123 



131 



36 



156 

 18 

 185 



3.67 



4.36 

 8.0 



7.5 



7.5 



8.8 



10.9 



6 



10 

 9 



10 



8 



14 



12 



( x ) 



27 



39 



44 



75 

 55 

 164 

 155 

 0) 



4.5 



3.9 

 4.9 



7.5 



6.9 



11.7 



12.9 



C 1 ) 



7 



5 

 12 



14 

 12 

 20 

 20 



7 



12 

 12 



17 

 15 

 20 

 39 

 5 



12 

 5 

 9 



4.1 



4.1 



6.4 



7.5 

 7.2 

 10.3 

 11.9 

 5.1 



4.9 

 4.5 

 4.6 



Bred from squares 

 collected in field. 

 Do. 



Aug. 13...- 



Aug. 2 



Aug. 13.... 

 Aug. 24-27.. 

 Sept. 9 



Okra bloom and 

 bud. 



Okra fruit 



do....' 



do 



do 



Bred from squares 

 and fed on blooms 

 until Aug. 7. 

 Collected in field. 

 Bred weevils. 

 Field collected. 

 Do. 



July 28 



July 28 



Hibiscus leaves. 



[Hibiscus blooms 

 Hibiscus buds. . . 

 [•Hibiscus bolls. . . 



on malvaceous 

 ts other than 



Collected in field. 







Not sexed. Not 

 included in aver- 

 ages by sexes. 



Do. 



Aug. 25 



July 28 



Do 















Do. 















Do. 



Aug. 18 

















Total 

 plan 



70 



531 



7.6 



39 



69 



559 



8.1 



20 



39 



6.7 











VARIETY GRANDIS WITH NORMAL FOOD. 



Kiv.-i'.H™ 



leaves . . . 



June 

 June 21 . . 

 Aug. 9 . . . 

 Sept. 17.. 



.do. 

 .do. 



Total on cotton leav< 



June 3 . . 

 June 9 . . 



July 8. . 

 Aug. 11 . 

 Sept. 7. 



•Cotton terminals 



....do.... 

 ....do.... 

 ....do.... 



Total on cotton ter- 

 minals 



VCotton bolls. 



June 23 



July 24 



June 20 . . . . i /-, . . 



June 21 [Cotton squares . . 



July 16.'.'.! ~.\\ , 



Aug.9 }— d0 



Total on cotton squares. 



Total all grandis on 

 cotton 



57 



540 



9.47 



40 



38 



401 



10.55 



27 



40 



9.91 



40 



269 



6.73 



17 



40 



259 



6.25 



15 



17 



6.60 



38 



258 



6.80 



17 



39 



332 



8.51 



32 



32 



7.66 



135 



1,067 



7.9 



40 



117 



992 



8.48 



32 



40 



8.17 



28 



468 



16.70 



43 



28 



627 



22.40 



42 



43 



19.55 



14 

 13 

 20 



232 

 142 

 259 



16.60 

 10.90 

 13.00 



32 

 31 

 31 



15 

 11 

 19 



282 

 159 



187 



18.80 

 14.50 

 9.84 



43 

 31 

 45 



43 

 31 

 45 



17. 72 

 12.54 

 11.44 



75 

 17 



1,101 

 345 



14.68 

 20.3 



43 



75 

 ~83 



73 

 17 



1,255 

 723 



17.19 



45 



45 



15.92 



42.53 



82 



82 



31.41 



729 



66.27 



13 



762 



58.62 



81 



83 



62.13 



5 



197 



39.40 



57 



5 



167 



33.30 



59 



59 



36.40 



16 



926 



57.88 



83 



18 



929 



51.61 



81 



83 



54.56 



243 



3,439 



14.15 



83 



225 



3,899 



17.33 



81 



83 



15.68 



Hibernated. 

 Bred. 

 Do. 



Field collected; 

 probably hiber- 

 nated. 

 Bred. 

 Do. 

 Do. 



Do. 



IBred. First gen- 

 / eration. 

 \ Bred. Second gen- 

 / eration. 





