HIBERNATION. 



Ill 



Table XLV.- 



-Summary of survival of the boll iveevil in all the more important 

 experiments. 



Places. 



Keatchic, La.. 1900.. 

 Mansura, La., 1909. . 

 Mansitra, La., 1910. . 

 Tallulah, La., 1910... 

 Tallulah, La.. 1911.. 

 Live Louisiana series 

 Dallas, Tex., 1907.... 

 Calvert, Tex., 1907... 

 Victoria. Tex., 1907.. 

 Dallas, Tex., 1908... 



Four Texas series 



Total of nine series. . . 



Total 

 number of 

 weevils 

 entering 

 hiber- 

 nation. 



24,700 

 16, 281 

 22, 179 



21,s:if, 

 8,439 

 93, 331 

 32, 439 

 20, 430 

 23,645 

 12, 087 

 88, 601 

 1S1.932 



Total 



number of 

 weevils 



surviving 

 hiber- 

 nation. 



731 

 3,260 



l.nux 



317 



•If, 



5,392 



3,464 



l.s:;.| 



3.020 



118 



8,442 



13, 834 



Percent- 

 age of 



survival. 



2.1 

 20.0 



4.6 



1.4 

 .5 



5.7 

 10.6 



8.9 



12.8 



.9 



9.5 



7.6 



The highest average percentage of survival for any locality is 20 

 per cent, at Mansura, La., in 1909, and the lowest average is 0.5 per 

 cent, at Tallulah, La., in 1911. The highest percentage of survival 

 in any cage was 47.72 per cent of 767 weevils, at Mansura, in a cage 

 with average conditions established December 14, 1908. The lowest 

 percentage of survival is no weevils, from 408, at Tallulah, in two 

 cages with average conditions, established November 15, 1910. 



RELATION OF FALL DESTRUCTION TO SURVIVAL. 



One of the most important recommendations for boll-weevil con- 

 trol is that of early destruction of the cotton stalks. It has long been 

 known that the earlier the stalks are destroyed the less chance the 

 weevils have of surviving. Table XLVI, showing the percentage of 

 emergence by dates of installation, affords an incontrovertible argu- 

 ment in support of this recommendation. 



Table XLVI. — Percentage of emergence of the boll weevil, by dates of installation. 



