52 HIBEKNATION OF THE COTTON BOLL WEEVIL. 



Table XXVIII. — Intermittent activity of lUi/cd emerged ivcevils, 1906. 



Locality. 



Calvert, Tex.. 

 Victoria, Tex. 



Brenhain, Tex 



When 

 collected. 



1905 



Nov. 25 



(Nov. 7,13 



\Dec. 11 



1906 

 Nov. 1 



When 

 put in hi- 

 bernation. 



1905 

 Nov. 27 

 Nov. 7,13 

 Dec. 11 



When 

 removed 

 from hi- 

 bernation. 



190G 

 Apr. 19 



■Apr. 6 

 Mar. 1 



When 

 rehiber- 

 nated. 



1906 

 Apr. 23 



Apr. 16 

 Mar. 7 



Weevils 

 put m rehi- 

 bernation. 



Date of 

 first ex- 

 amina- 

 tion. 



May 10 

 Apr. 24 



May 11 



Locality. 



Weevils 

 surviv- 

 ing. 



Date of 

 second 

 exami- 

 nation. 



Weevils 

 surviv- 

 ing. 



Date of 

 third 

 exami- 

 nation. 



Weevils 

 surviv- 

 ing. 



Date of 

 death of 

 longest 

 survival. 



Average 

 length of 

 life in 

 rehiljer- 

 nation. 



Calvert, Tex... 

 Victoria, Tex.. 

 Brenham, Tex 



May 22 

 May 10 

 May 23 



Juno 8 

 May 'si" 



June 8 

 May 10 

 May 31 



Days. 

 30.4 

 19.1 

 67.4 



The records for Calvert and Brenham show a very remarkable 

 power of endurance in some weevils, the average survival for the 

 two lots of 20 and 8 weevils being over thirty and sixty days, 

 respectively. 



CLIMATIC CONDITIONS PRODUCING EMERGENCE FROM HIBERNATION 

 AT DALLAS, TEX., IN 1906. 



In the figure given below, representing climatic conditions and 

 the emergence at various dates, the temperature line given repre- 

 sents only the mean average effective temperature. 



In tliis case, as at Keatchie, the emergence occurred especially dur- 

 ing four well-defined periods and the conclusions stated in connection 

 with figure 1 apply equally well to the results shown in figure 2. 



EMERGENCE IN THE FIELD AT VICTORIA, TEX., IN 1906. 



The observations upon emergence in the field at Victoria, Tex., 

 in 1906, were begun too late in the spring to indicate the limits of 

 the first part of the period of emergence. For this work a field of 

 about one-half acre was selected in which it was apparent early in 

 May that there would be a large number of hibernated adults. The 

 observations were planned to furnish information particularly upon 

 two points under field conditions: (1) The determination of the 

 period of emergence and (2) the period of activity of emerged wee- 

 vils. The work w^as done by Mr. A. C. Morgan, who devoted par- 

 ticular attention to a study of this field throughout the season of 

 1906. Tlie method followed was to examine every plant and every 

 square or boll throughout this area. After the first two examina- 



