40 



BULLETIN 926, U. S. DEPARTMENT OF AGRICULTURE. 



The rate of emergence in Florida as compared to the rates of 

 emergence in Louisiana and Texas is illustrated in the accompanying 

 diagram (fig. 18). Twenty-five per cent of the boll weevils emerge 

 in Florida a few days before the same percentage emerges in Texas 

 and at least 20 days earlier than in Louisiana. The rate of emergence 

 in Texas shows that 50 per cent of the weevils are out of hibernation 

 approximately 20 days before 50 per cent are out in Florida. After 

 50 per - cent of the weevils emerge the figure shows that the rate of 

 emergence in Florida closely approximates the rate of emergence 

 in Louisiana. This is to be expected since the hibernation shelter in 

 Louisiana and Florida is decidedly more dense than the hibernation 

 shelter found in Texas. Table XVII presents the records showing 

 the percentage of total emergence of the boll weevil at different dates 

 and places where hibernation experiments have been conducted. 



Table XVII. 



-Percentage of total emergence of boll weevils at different dates 

 and at different places. 



Date. 



Keatchie, 

 La., 1906. 



Tallulah, La. 



Mansura, La. 



Dallas, Tex. 



Calvert, 

 Tex., 

 1907. 



Victoria, 

 Tex., 

 1907. 



Madison, 

 Fla., 





1910. 



1911. 



1910. 



1909. 



1907. 



1908. 



1919. 



Feb. 21 . . 

 Feb. 2S ... 

 Mar. 7 



Mar. 14 



Mar. 21 



Mar. 28 



Apr. 4 



Apr. 11 ... 

 Apr. 18 ... 



Apr.25 



May 2 .... 

 May 9 

 May 16 



May 30 



June 6 



June 13 



June 20 



June27 



July 4 



July 7 



0.00 



.00 



.00 



.00 



.00 



3.93 



6.87 



24.54 



32.11 



40.67 



52.73 



60.44 



72.22 



86.41 



91.60 



97.36 



99.19 



99.61 



93.89 



100. 00 



0.31 



.31 



6.62 



10.09 



13.56 



23.34 



35.95 



41.95 



46.05 



48.89 



61.83 



70.66 



75.39 



88.64 



93.69 



99.05 



99.68 



99.68 



100. 00 



100. 00 



36.95 

 36.95 

 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 



1.64 



3.28 



10.56 



15.69 



21.19 



38.05 



46.53 



49.42 



52.41 



53.86 



60.41 



72.35 



75.64 



84.77 



92.77 



98. 43 



99.89 



100. 00 



100. 00 



100. 00 



7.20 

 10.61 

 19.22 

 19.73 

 23.24 

 30.96 

 38.16 

 43.87 

 47.78 

 56.39 

 61.30 

 67.51 

 75.12 

 82. 43 

 89.73 

 96.83 

 97.83 

 98.74 

 99.94 

 100. 00 



0.00 



.00 



24.48 



36.36 



57.14 



71.72 



75.70 



81.28 



84.46 



85.74 



88.62 



92.30 



95.75 



98.76 



99.34 



99.78 



99.88 



100.00 



100. 00 



100. 00 



0.00 



.00 



7.27 



23.63 



45.45 



55.45 



63.63 



68.18 



74.54 



87.27 



90.91 



91.82 



94.55 



98.18 



98. }8 



99.09 



99.09 



100. 00 



100.00 



100. 00 



0.00 



.00 

 22.80 

 31.90 

 44.30 

 57.20 

 64.20 

 70.40 

 77.40 

 79.51 

 82.62 

 88.73 

 91.94 

 94.95 

 97.56 

 99.17 

 99.68 

 99.99 

 100. 00 

 100. 00 



0.00 

 12.01 

 27.92 

 48.23 

 66.24 

 79.35 

 84.16 

 89.58 

 93.80 

 95.02 

 95.88 

 97.50 

 98.36 

 98.92 

 99.18 

 99.90 

 99.97 

 100. 00 

 100. 00 

 100. 00 



3.6 

 5.03 

 21.9 

 30.2 

 34.2 

 36.4 

 41.4 

 52.3 

 57.7 

 58.4 

 61.2 

 85.4 

 90.4 

 92.5 

 94.7 

 98.5 

 99.1 

 99.6 

 99.9 

 99.9 

 100.00 

























NUMBER OF BOLL WEEVILS SURVIVING THE WINTER WHEN HIBERNATING IN 



THE OPEN FIELD. 



In Table XVIII are presented the data on the number of weevils 

 surviving the winter when installed in the hibernation cages at dif- 

 ferent dates in the fall under open field conditions. Of a total of 

 4,300 weevils installed in the cages an average of 5.76 per cent sur- 

 vived the winter. The cage installed on November 15 showed the 

 greatest percentage of the total emergence, while the cage installed 

 on October 1 gave the smallest percentage of emergence. Emergence 

 from hibernation started in all of the cages, except the one installed 

 on December 1, on February 20. As was to be expected the date of 



