HIBEKNATION AND DEVELOPMENT OE BOLL WEEVIL. 



29 



tions. From 405 squares which were kept on moist soil or between 

 shaded rows weevils were developed from 38. 6 percent, but where the 

 squares were left in the hot sun, among 1,123 squares but 1 per cent 

 produced weevils. This shows strikingly the value of having rows 

 wide apart so that the sun may strike the fallen squares. 



Table V. — Percentage of mortality of weevils at different stages of development. 





Date. 



Picked 

 from — 



Condition. 



CO 



Dead. 



Alive. 



^05 



o 

 v. B 





Lot. 



32 



> 







3 

 H 



> 



(-1 



& 



EC 



<v 



05 



o 



Remarks. 



1 



Aug. 12 



July 14 



1904. 

 July 8 



Sept. 11 



Sept. 22 



Sept. 21 

 ....do... 



Ground 





133 



572 



1,522 



200 



43 



36.3 

 44 



57.6 



60 



69 



L5 

 2 



0.5 



2.2 

 3 







28 

 23 



4 

 11 







24 

 17 



39 



39.5 



21 



56 

 51 



39 



39.5 



30 



Counted just 

 from field. 

 Do. 



2 



.. do 













3 



do ... 





3.4 



... 



... 



.... 



Allowed to 



4 



....do... 

 ....do... 



In shaded 



rows. 

 do.... 



emerge. 

 Do. 



5 









7 



2 







Partly al- 

 lowed to 

 emerge. 





....do... 

 .do 



In sun 



do.... 



Squares 



brown. 



Squares 



green. 

 do. a.. 



average... 

 s in which 

 nd. 



Squares 

 green. 















6 



210 



68 

 100 



268 



400 



64 



92.8 

 61 



65 



59.5 



32 



r 







0.6 



1.4 



1 



11 

 1 



1.4 



4.4 

 3 



9 







0.5 



1.4 

 10 



4.8 



30.5 



2.5 



7.2 

 15 



26.6 



31.5 



Do. 



7 











Do, 



8 



do i do 



18 



s 



2 



0.7 

 a6.8 







1 



L8 



2L8 



Counted just 

 from field. 

 Do. 



Allow'ed to 



9 

 10 



....do... 

 Sept. 11 



....do... 

 Plants . . 



1 

 5.61.5 



1.80.5 











emerge. 





Lots 6-10, weightet 

 Average of souare 



1,046 



63 



101 

 26 3 



3 



8 



77 

 37 



44 



5.4 



14 



55 



3.1 

 10 



1 



0.5 

 1 



9 



25 



56 



14.8 

 39 











Seven died in 



11 



some s1 



1904. 

 Oct. 5 



;age is fou 

 Plants a. 



TOO 



44 







emerging. 



Counted just 

 from field. 











a Squares picked from plants when just ready to drop. 



The count made on October 5, 1904, fully confirms this. These 

 squares were picked from the plants, taking those that would drop 

 into the hand when touched, as in previous similar work. An imme- 

 diate examination showed that 55 per cent contained live larvae of 

 various sizes, but mostly about half grown. Tho a few were read}^ to 

 pupate, but one pupa was found, while there were 14 in which the work 

 of young larvae was clearly recognizable but in which no larva could 

 be found. All squares showed egg punctures, but no eggs could be 

 found in them. 



The time at which the greatest mortality in the development of the 

 weevil occurs is a matter of some practical importance and the data 

 given in Table V throw considerable light upon this point. We have 

 but few observations as to the mortality in the egg stage, but Hunter 

 and Hinds state that but few eggs fail to hatch, which we have found 

 to be the case in the laboratory. As the square receiving an egg does 



