﻿STUDIES OF THE PINK BOLLWOEM IN MEXICO 



11 



The bolls were placed in a single layer and the lots widely enough 

 separated from one another to allow ample room for the examination 

 of 1 square yard of soil with each lot of bolls. Then, at first weekly 

 and later biweekly examinations of one lot of bolls and the square 

 yard of aoil underneath, to the depth of 6 inches, were made, with 

 results as given in Table 8. 



Table 8. — Entrance of pink bollworm larvss from bolls on the surface of the soil 



into soil for hibernation 





Date examined 



Foimd in bolls 



Found in sol! 





Larvae and pupse— 



Pupal 

 cases 



Larvae and pupae— 



Pupal 





Living 



Dead 



Living 



Dead 



cases 



Nov. 28 1 



1922 



228 

 162 

 152 

 144 

 125 



143 



120 



76 



65 



2 30 



19 



5 



13 

 12 

 35 

 14 

 25 



16 

 49 

 30 

 43 

 2 55 

 60 

 43 



11 

 3 

 6 



1 

 



1 

 

 3 

 1 

 1 

 6 

 3 







Dec. 5. 

 11. 

 18. 





23 

 9 



14 

 29 



12 

 30 

 14 

 21 

 22 

 32 

 9 



1 

 

 1 

 3 





 1 

 2 

 5 

 1 

 4 

 3 





 

 



25 







Jan. 8 . 



1923 







22 







Feb. 5.. 







20 







Mar. 5 







19 







Apr. 2 









erages 





Av 



f 94.6 



34.7 



2.3 



• 19.5 



2.0 







I 131.6 





21.5 



> This represents examination of bolls at start of experiment, as a check, and is not included in averages. 

 2 Only 97 boUs in this examination. 



The procedure followed in the experiment with bolls or stalks 

 (Table 9) was the same as that in the experiment just described, 

 except that instead of placing the bolls on the surface of the soil 

 they were supported on stakes above the ground in such a way as 

 to represent tne same conditions that they would be under were they 

 still on the stalks in the field. These bolls were set out on December 

 2 and 4 and examinations were made biweekly. 



Table 9.- 



'Entrance of pink bollworm larvae from bolls on stalks into the soil for 

 hibernation 





Date examined 



Found in bolls 



Found in soil 





Larvae and pupae- 



Pupal 

 cases 



Larvae and pupae — 



Pupal 





Living 



Dead 



Living 



Dead 



cases 



Nov. 28 »-. 



1922 



228 

 227 

 279 



285 

 232 

 248 

 133 

 130 

 130 

 131 

 129 



13 



20 



7 



9 

 13 

 17 

 22 

 15 

 24 

 , , 48 

 29 



11 

 12 



5 





 !) 

 1 

 4 

 3 

 4 

 3 

 2 









Dec. 7 



4 

 3 



2 

 7 

 G 



1 

 





 



9. 







19 







Jan. 1 



1023 







16 







30 



n 



Feb. 13 





27 



1 

 

 3 

 2 



1 1 



Mar. 13 







27 , 



1 



Apr. 10 - 



1 1 









.\vcrages.. 



f 193 



20.4 

 217.9 



4.5 



3. 1 ! 0. 6 1 

 3.7 



> This re[)rc.<»;nts an examination of bolls at the titart of the experiment, as a check, and is not Included 

 in the averages. 



