COTTON BOLL WEEVIL IN THE MISSISSIPPI VALLEY. 

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



VARIETY GEANDIS WITHOUT NORMAL FOOD. 





Substance pro- 

 vided. 



Males. 



Females. 



Both 

 sexes. 





Date. 



a 



03 



i 



60 

 PI 

 O . 



»>> 



2 



> 



< 



o 



si' 



X 



CD 



1 

 ■a 



1 



^ ■ 



> 



a 

 o . 



«^ 



^■" 



> 



o 



o 



03 



> 



60 



a 



o . 



2 



> 



Notes on weevils. 







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 



Dys 



15 



11 



5 

 3 

 10 



Dys 



40 



11 



t 



10 



Days. 

 2.9 



5.48 



2.20 

 2.50 

 3.30 



Hibernated wee- 





do 



vils. 

 Collected in field. 



June 29 ... . 



do 



Hibernated. 

 Bred. 



Sept. 8 



do 



Do. 



Aug. 13.... 



do 



without food 



Yornigokra fruit 

 do 



Do. 



Total 



136 



440 



3.24 



40 



6 



12 

 11 



17 

 15 

 18 

 39 



91 



6 



10 

 9 



10 



8 



14 



12 



(1) 



353 



3.88 



15 



40 



3.49 





July 2 



July 22 



6 



11 



9 



10 



8 

 14 

 12 



7 



32 



4 



40 



70 



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 



27 



39 

 44 



75 

 55 

 164 

 155 

 (1) 



4.5 



3.9 

 4.9 



7.5 



6.9 



11.7 



12.9 



0) 



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 . - 



Okra bloom and 

 bud. 



Okra fruit 



do 



Bred from squares 

 and fed on blooms 

 until Aug. 7. 

 Collected in field. 

 Bred weevils. 



Aug. 24-27. . 



do 



Field collected. 



Sept. 9 



do 



Do. 



July 28 



July 28 



Hibiscus leaves. 



JHibiscus blooms 

 Hibiscus buds. . . 

 VHibiscus bolls. . . 



on malvaceous 

 ts other than 

 in 



Collected in field. 







Not sexed. Not 

 included in aver- 

 ages by sexes. 



Do. 



Aug. 25 



July 28 



Do 















Do. 















Do. 



Aug. 18 

















Total 

 plan 



531 



7.6 



39 



69 



559 



8.1 



20 



39 



6.7 











VARIETY GRANDIS WITH NORMAL FOOD. 



S\|V '^Cotton leaves... 



June 7 ■ , 



June 21... ?---ao. 



Aug. 9 



Sept. 17.. 



}... 



do. 



Total on cotton leaves. 



June 3 



June 9..'.. 



July 8 



Aug. 11... 

 Sept. 7.... 



VCotton terminals 



-do. 

 -do. 

 -do. 



Total on cotton ter- 

 minals 



Cotton boUs. 



June 23 . . . 

 July 24. . . . 



S2?"""-}Cotton squares. 

 J-^lylS ,}.... do 



Aug. 9. 



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 



28 



1,067 



7.9 



40 

 43 



117 



28 



992 



8.48 



32 



40 



8.17 



468 



16.70 



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 



1,101 



14.68 



43 



73 



1,255 



17.19 



45 



45 



15.92 



17 

 11 



345 



20.3 



75 



17 



723 



42.53 



82 



82 



31.41 



729 



66.27 



83 



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 c o 1 1 e cted; 

 probably hiber- 

 nated. 

 Bred. 

 Do. 

 Do. 



Do. 



\Bred. First gen- 

 / eration. 

 \Bred. Second gen- 

 / eration. 



