110 THE MEXICAN COTTON-BOLL, WEEVIL. 



Table XLIII. — Percentage of total emergence of the boll weevil out at given dates. 



Date. 



Tallulah, 

 La., 

 1911. 



February 21 

 February 2S 



March 7 



March 14. . . 

 March 21 . . . 

 March 28... 



April 4' 



April 11 



April 18 



April 25 



May 2 



May 9 



May 16 



May 23 



May 30 



June 6 



June 13 



June 20 



June 27 



July 4 



36.95 

 30.95 

 39.92 

 63.83 

 70.35 

 72.52 

 74.69 

 81.21 

 87.73 

 96.42 

 96.42 

 98.59 

 98.59 

 98.59 

 98.59 

 100.00 

 100.00 

 100.00 

 100.00 

 100.00 



The nature of the shelter in which the weevils are hibernating has a 

 decided influence upon the rate of emergence, as is shown in Table 

 XLIV, based upon the experiments of the Louisiana Crop Pest 

 Commission at Mansura, La., in 1909. 



Table XLIV.- 



-Effect of nature of shelter upon rate of emergence of the boll weevil, at 

 Mansura, La., 1909. 



Character of hibernating quarters. 



Average quarters (cag^s 5 and 51 ) 



Open field (cages A a d 5) 



Swamp (cages Band 51) 



Moss (cages A and B) 



Dates by which certain percentages of the 

 surviving weevils were out of hibernation. 



25 per cent. 



March 19. 

 March 31. 

 April 8... 

 April 13.. 



50 per cent. 



April 12. 

 April 29. 

 Mav 20. . 

 ...do... 



75 per cent. 



May 15. . . 

 May 24. . . 

 June 1 . . . 

 June 2. . . 



100 per 

 cent. 



June 27. 



June 21. 



June 29. 



Do. 



It will be noticed that only four cages entered the consideration, 

 cage 5 being average quarters in open field, cage 51 being in average 

 quarters in swamp, cage A being Spanish moss in open field, and cage 

 B being moss in swamp. 



SURVIVAL OF HIBERNATED WEEVILS. 



The central idea in all the hibernation experiments has been the 

 determination of the percentages of weevils which survive under 

 different conditions and different treatments. In obtaining the facts 

 which have been discussed in the preceding and following paragraphs 

 on hibernation the grand total of 181,932 weevils has been used. 

 With such a large series it is reasonable to suppose that the average 

 percentage of survival must veiy nearly approximate the normal. 

 This survival in nine series of experiments conducted in seven years 

 at six localities representing the principal climatic, shelter, and other 

 conditions of the infested region has been 7.6 per cent. Table XLV 

 presents the final summaries of each ot the nine series. 



