74 



HIBERNATION. OF THE COTTON JioLL WEEVIL. 



EFFECT OF TIME <>F ENTERING HIBERNATION AND NATURE OF SHELTER 

 DPON THE PERCENTAGE OF BURVTVAL. 



One of the most important points upon which information was 

 sought throughout these experiments was the effect of time of enter- 

 ing hibernation and nature of shelter upon the percentage of survival. 

 The first confinement of weevils in the fall occurred fully a month 

 earlier than the beginning of similar experiments the previous year, 

 and it was expected that the intervals between their confinement in 

 the cage and the time for successful hibernation might be sufficient to 

 plainly reduce the proportion of weevils surviving. 



Table XXXVII.- Chronological arrangement of sectional records showing relative 

 survival at Dallas, Calvert, and Victoria, !■ .. . • I 



DALLAS. 



- - 



When tion 

 started, num- 

 ber. 



Character of shelter and food. 



Date of Basis 



number 

 emer- 

 gence 



Total Percent- 

 weevils age of 

 weevils. emer ^ d - survival. 



Rank of 

 section in 

 survival. 



1906. 

 Oct. 13 



Oct. 16 



Oct. 20 



Oct. 21 



Oct. 30 



Nov. 5 



Nov. 12 

 Nov. 13 



Nov. 15 



Nov. 21 

 Nov. 2S 



Dec. 6 



1 Leaves and hay. 4 inches deep, cot- 



ton stalks left a 



4 Leaves and hay; stalks cut and left 



four days b 



2 Leaves and grass 4-5 inches deep; 



no food 



- .nish moss and chips: c cut food.. 



8 Leaves and grass 2-3 inches deep; 



no food d 



5 Leaves and grass 9-10 inches deep: 



stalks cut and left t 



3 Leaves and grass: no food 1 



9 Leaves 8-10 inches deep; green cot- 



ton cut and left g 



11 Leaves 3-4 inches deep: stalks left 



standing 



12 do 



6 Bare ground: no food 



in /Bolls i on surface ; 



1U \Bolls I buried ; 



1907. 



May 21 



May 6 



May 19 

 June 17 



June 15 



May 15 



May 21 



June 19 



June 4 

 June 8 

 A] r. 29 



'May 2 



3,800 



2,090 



3.610 

 3,325 



2,850 



3,135 

 3,040 



3,040 



2,565 



1,570 



975 



22 



231 



448 



804 

 65 



39 



2.61 



4.07 



6.26 

 6.95 



&85 



12.22 

 14.74 



25.92 



31.34 

 M. 14 



4.72 



Total and average. 



! 



3,464 



CALVERT. 



Oct. 



13 



1 



Oct. 



19 



4 



Oct. 



-- 



7 



Oct. 



31 



8 



Nov. 



5 



5 



Nov 



12 



9 



Nov. 



11 



3 



Nov 



.' 



6 



Nov 



26 



2 



Dec. 



3 



10 



Food, two days; grass and leaves 

 4-5 inches deep 



Grass and leaves 4-5 inches deep 



Spanish moss: chips 



Food two days; grass and leaves 4-5 

 inches deep 



Food dry: grass and leaves 4-5 

 inches deep 



Food cut down, left dry: 10 inches 

 Dd leaves ". 



Stalks cut down, left dry; 2 inches 

 :k3 leaves ". 



Field protection or bare: soi 



Xo food: leaves and hay 



Bolls " 



Total and a 



June 12 

 May 30 



July 1 



• - 

 June 12 

 May 31 



Mar. 21 



2.375 

 - 7; 



2,375 

 _ U 



-- 

 58 

 (*) 



- 



116 



: ■ 



4.5 



S 

 - 



9 





3.15 

 L88 



4.42 



lv-14 



10.65 

 25. 19 

 27 18 



9.49 



- •■ PI. VII, fig. 2. 



R. 3. 



- PI. VIII, figs. l. 2. 



I. IX, fig. 1. 

 I. IX, fig. 2. 

 !. IX. fig. 3. 



- Pl.X, fig. 2. 



ft The weevils put in on November 21 were brought from Brownsville, Tex. The low pei 

 surviv resulted from their weakened condition, owing to insufficienl food during transportation. 



i Bolls presumably infested. 



I. X. fig. l. 

 * No estimate made. 



