HIBERNATION. 



Ill 



Table XLV. — Summary of survival of the boll weevil in all the more important 



experiments. 



Places. 



Total 

 number of 

 weevils 

 entering 

 hiber- 

 nation. 



Total 

 number of 



weevils 

 surviving 

 hiber- 

 nation. 



Percent- 

 age of 

 survival. 



Keatchie, La., 1906 



24,700 

 16, 281 

 22, 179 

 21,835 

 8,439 

 93,331 

 32, 439 

 20, 430 

 23,645 

 12, 087 

 88, 601 

 181, 932 



731 

 3,260 

 1,038 



317 

 46 

 5, 392 

 3,464 

 1,834 

 3, 026 



118 

 8,442 

 13, 834 



2.1 



Mansura, La. , 1909 



20 



Mansura, La., 1910 



4.6 



Tallulah, La., 1910 



1.4 



Tallulah, La,, 1911 



.5 



Five Louisiana series 



5.7 



Dallas, Tex., 1907 



10 6 



Calvert, Tex., 1907 



8.9 



Victoria, Tex., 1907 



12.8 



Dallas, Tex., 1908 



9 



Four Texas series 



9.5 



Total of nine series 



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 c 



\f the boll weevil, 



by dates 



of installation. 



Place. 



Sept. 16- 

 30. 



Oct. 1- 

 15. 



Oct. 16- 

 31. 



Nov. 1- 

 15. 



Nov. 16- 

 30. 



Dec. 1- 



15. 



Dec. 16- 

 31. 



Texas points. 

 Dallas, 1907 



Per cent. 



•Per cent. 

 2.61 

 3.15 



Per cent. 

 6.67 



6! 17 



2.8 



Per cent. 

 20.57 

 10.33 

 17.69 

 1.68 



Per cent. 



4.36 



2.65 



16.22 



5.26 



Per cent. 



Per cent. 



Calvert, 1907 









Victoria, 1907 









Dallas, 1908 



0.23 



.39 













Texas, weighted average 



.23 



2.33 



5.62 



15.42 



16.05 















5,213 



7,729 



27,806 



30,431 



12, 173 













Louisiana points. 

 Keatchie, 1906 











2.71 

 24.56 

 6.31 

 2.4 



3.23 



43.23 



6.79 



.00 



.00 



0.8 



Mansura, 1909 



2.7 

 .23 

 .34 



3.31 

 1.31 

 2.23 

 1.15 



23.9 

 6.58 

 1.16 

 .54 



23.8 

 9.95 

 1.53 



.00 



37.06 







Tallulah, 1910 





Tallulah 1911 













Louisiana, weighted aver- 



.37 



2.00 



8.04 



8.82 



6.07 



10.65 



12.61 









8,186 



14,218 



24, 464 



9,620 



24, 252 



10, 208 



1,483 







Grand weighted average 



0.31 



2.07 



6.58 



14.26 



9.00 



10.65 



12.61 







Total weevils installed 



13,399 



„ 21,947 



52,270 



40,051 



36,425 



10, 208 



1,483 



