6 BULLETIN 368^ U, S. DEPARTMENT OF AGRICULTURE. 



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



VARIETY THURBEEIAE. 





Substance pro- 

 vided. 



Males. 



Females. 



Both 

 sexes. 





Date. 



a> 



a 



•B 



> 



a 

 o . 



C3 



> 



< 



a 

 1 



3 



>. 



'> 

 > 



> 



n 



o . 



a 



o 



at 

 II 



X 



o 



si- 

 ll 



> 



o . 



U 



Notes on weevils. 



Aug. 30 



May 3 



July 15 



Okra fruit 



Cotton leaves . . . 

 do 



8 

 11 

 5 



163 



647 



350 

 1,136 



250 



531 



Days. 

 20.4 



58.82 



70.0 

 71.0 



41.7 



53.1 



Dys 

 39 



97 



78 

 104 



61 



73 



8 

 10 



129 

 616 



Days. 

 16.1 



61.6 



Dt;s 



37 



78 



Dys 

 39 



97 



Days. 



18.3 



60.14 



Removed from 

 bolls collected in 

 Arizona Mar. 1, 

 1915. 



From Tliurberia 

 bolls collected in 

 Arizona Mar. 1, 

 1915. 

 Do. 



July 18 



Sept. 29.... 



July 17 



Sept. 22.... 



July 27 



Sept. 29.... 



X First generation 

 / on squares. 

 ^Second genera- 

 / tion on squares 



|0n cotton bolls.. 



19 

 10 

 9 



1,269 



478 

 392 



66.8 

 47.8 

 43.6 



89 

 66 

 73 



104 

 66 

 73 



68.7 

 45. 5 

 48.6 



Do. 

 Do. 



Do. 



Total 

 cott 



all thurberiae on 



48 



2,914 



60.71 



104 



48 



2, 755 



57.40 



89 



104 



59. 05 

















1 "Weevils not sexed. 



The grandis males averaged 3.24 da3^s with no food; 7.6 days on 

 ola"a and Hibiscus: 7.9 days on cotton leaves; 14.68 days on cotton 

 terminals; 20.3 days on cotton boUs, and 57.88 days on cotton 

 squares. The average longevity of male grandis on parts of the cotton 

 plant was 14.15 days. 



The thurberiae males averaged 20.4 days on okra fruit; 62.3 days 

 on cotton leaves, 53.1 days on cotton bolls, and 63 days on cotton 

 squares. The average longevity of thurberiae males on parts of the 

 cotton plant was 60.71 days. 



The grandis females averaged 3.88 days with no food; 8.1 days on 

 okra and Hibiscus; 8.48 days on cotton leaves; 17.19 days on cotton 

 termmals; 42.53 days on cotton bolls, and 51.61 days on cotton 

 squares. The average longevity of female grandis on parts of the 

 cotton plants was 17.33 days. 



The thurberiae females averaged 16.1 days on okra fiiiit; 61.6 days 

 on cotton leaves; 43.6 days on cotton bolls, and 60.2 days on cotton 

 squares. The average of female thurberiae on parts of the cotton 

 plant was 57.4 days. 



A comparison of the longevity of the two varieties on okra fruit, 

 cotton leaves, cotton bolls, and cotton squares is shown in Table III. 



