EMERGENCE PROM EIBEBNATION, L907. 73 



Tin 1 unprecedented emergence during March is very easily explained 

 by the remarkable temperature conditions during thai month. In 

 spite of the fact thai emergence began earlier thau bad ever been 

 known previously, it continued Inter also because of the exceptionally 

 low temperatures prevailing during April, May. and June. A com- 

 parison of figures I ami 2 with figures 6 to s is interesting and shows 

 how strikingly the nature of the emergence movement may vary in 

 respect to difference in climatic conditions. The careful examina- 

 tions made to discover tin 4 termination of the emergence period were 

 Continued for fully two weeks after the last weevil was found. It 



seems impossible to explain the long-delayed emergence of some 

 individuals. The lack of an explanation, however, does not alter the 

 fact that emergence is probably not generally complete until after the 

 middle of June. 



Table XXXVI. General summary of experiments <>f X906 7 <>n < /n< rgi net from 



hi I" ma/ ion. 





Numix r of 

 u< evils- 



Number 

 of wee- 

 vils 



emer- 

 ging 





Locality. 



Put in 

 cages. 



Used as 

 basis for 

 percent- 

 age of 

 emer- 

 gence, a 



Percent- 

 emer- 

 ging. 



Dallas, Tex 



32, 439 

 20, 430 

 23,645 



30,864 

 19,408 

 22, 163 



:i. 164 



l 842 



&3,026 



11.22 



Calvert. Tex 



9.49 





13.47 







Total and average 



76,514 



72, 735 



8,332 



11.45 







sis for computing the percentage of emergence is ."> per cent less than the number of weevils pul in 

 wing to I he escape of some weevils through tin 1 meshes of the wire. 

 8 Two weevils not in summary. 



A deduct ion of 5 per cent from the number of weevils placed in the 

 hibernation experiments is made to furnish a more correct basis for 

 determining percentages, on account of the fact that experiments 

 have shown that about 5 per cent of a miscellaneous collection of 

 weevils may be able to escape through 14-mesh wire (PL VII, fig. 1), 

 such as was used in the construction of these cages. The percentage 

 of survival is strikingly similar in each locality. The average sur- 

 viving hibernation — approximately 11 per cent — is probably the 

 highest that has ever occurred since the weevil entered Texas. 

 Although observations have indicated that occasionally the per- 

 centage of survival may be as high as this in the field, it is fortunate 

 for the cotton planter that such is very rarely the case. 



