28 



iiii;]:!;nati(>n of the cotton boll weevil. 



YYIiil. these records show thai few if any weevils survived in t lie 

 shelter of bolls during this season ii musl be remembered that the 

 weevils were not exterminated in all of these localities. Other i 

 ditions of shelter were evidently so much more favorable than bolls 

 as to have enabled the weevils to survive this severe winter. It is 

 true, however, that in tin 1 spring of 1905 weevils occurred in much 

 smaller numbers than is usually the case. 



Other examinations of bolls show that in the northern portion of 

 the infested area of Texas there is a smaller percentage of living stages 

 in the bolls than in the southern portion. The data for three seasons 

 are compared in Table IX. The periods selected are during the 

 lasl of the winter season in each year. 



Table IX. — Increase in percentage of sum ml in boll* from northern to southern I 









March 



, 1904. 







try and March, 1905 







Bolls 



exam- 

 ined. 



Stages alive. 



Bolls 



having 

 living 

 forms. 



Living 

 forms. 



Bolls 

 exam- 

 ined. 



Stages alive. 



Bolls 

 having 

 living 



forms. 





Section. 



88 



> 



88 



ft 



Adults. 



> 



83 



- 

 - 



Adults. 



Living 

 forms. 





<6 



O M 

 03 



t5 

 3. 



c _ 



v. - 



X 







Northern 2,000 



Central 180 



Southern 250 





 

 





 

 











23 







1 



28 



Per ct. 

 



0. 55 



Per ct. 

 



3,258 

 4, 575 

 9, 589 



4 

 

 4 



! 



1 





 4 

 4 





 



14 

 11 



Per ct. 



0. 27 

 .00 

 .24 



1.80 



Per ct. 



0.026 



.000 



. 096 







S09 

























February and March, 190G. 



Total. 





Bolls 



exam- 

 ined. 



Stages alive. 



Bolls 



having 

 living 

 fonns. 



Living 



forms. 



Bolls 

 exam- 

 ined. 





Section. 



i 



> ■ 

 S3 



88 



ft 



Adults. 



Stages 



found 





s 



■d 

 1 



alive. 





G, 186 

 6,650 

 1,410 





 

 









 



1 



5 

 1 



2 



1! 

 10 



Pa ct. 

 0.04 



.24 

 .78 



Per ct. 

 

 

 



12.044 

 11,405 



1 1 . 249 

 809 



12 





17 





£ 



Brownsville 



! 





















It is noticeable that there is a gradual increase in the living stages 

 from north to south, and that toward the end of the hibernation period 

 nearly all of the living stages are adults, most of which had matured 

 before the beginning of hibernation. 



That the increased mortality found in bolls during the winter of 

 1904-5 can not be attributed entirely to the exceptional severity of 

 that season is shown by the fact that a similar decrease in the per- 



