﻿STUDIES OF TH.E PIISIK BOLLWORM IN MEXICO 



Table 6. — Soil examinations for 



oinJc bollworms, 1921 cotton fields 







Number 



Of 



square 



yards 



examined 



Living stages found in soil 



Dead 



larvae 



and 



pupae 



Pupal 

 cases 



Date examined 



Larvae 



Pupae 



Total per 



square 



yard 



1921 

 July 21. 





4 



9 



1 

 74 

 5 

 7 

 

 

 

 

 





 n 



5 



83 

 10 

 51 

 12 



2 



5 



27 

 11 



15 



10 



15 

 4 

 9 

 8.25 



16.6 

 8.6 

 8.4 

 4.4 

 3.2 

 1.8 

 1 

 

 

 



9 



24 



20 



24 



5 







2 



3 



4 



6 



2 



5 



6 



4 



33 



49 



18 



20 



21 



12 



13 



8 







1 



1 







Aug. 4 



15 



19 



1 i 5 

 1 j 44 

 1 1 12 



1 ; 2 



1 1 ^ 



85 



Sept. 6 



5 



25 .. 



7 



Oct. 18 



41 



29 -. 



12 



Nov. 28 



I 



14 

 5 

 5 

 5 

 5 

 5 

 5 

 5 

 5 

 5 

 5 



27 

 11 



15 

 10 



2 



Dec. 16 



13 



1922 

 Jan. 3 



10 



20 



9 



Feb. 6 



15 1 

 4 



6 



15 



10 



28 



9 

 33 

 83 

 43 

 42 

 22 

 16 

 9 

 2 

 

 

 





 

 

 

 

 

 

 

 3 

 

 

 



3 



Mar. 21 ... 



4 



23 



6 



Apr. 17 . . 



1 



May 1 







■ 17 



1 



30 



1 



June 12 ... ... . 



2 



26 



5 



July 10 



1 



24 







Aug. 8 .. 



1 







' This examination and all subsequent ones, except that on Mar. 23, include some samples from plats 

 cultivated in March and April, 1922. 



Table 7. — Soil examinations for pink bollworms, 1922 cotton fields 





Number 



of 

 square 

 yards 



examined 



Living stages found in soil 



Dead 



larvae 



and 



pupae 



Pupal 

 cases 



Date examined 



Larvae 



Pupae 



Total per 



square 



yard 



1922 

 Aug. 8 . 



4 



4 



4 



4 



4 



4 



4 



3.33 



3.33 

 .83 

 .83 

 .83 

 10 



5 



5 



5 



5 



5 



5 



5 



5 • 



5 



5 



5 



5 



5 



5 



5 



5 



5 



1 

 1 



11 



31 



14 



31 



10 



15 



11 



3 



4 



10 



52 



108 



102 



57 



103 



75 

 81 

 66 

 79 

 49 

 70 

 57 

 45 

 66 

 32 

 62 

 45 

 27 

 28 

 22 





 1 

 1 

 1 

 1 

 3 

 

 7 

 4 

 

 

 

 

 

 3 

 

 





 

 

 

 

 2 

 

 1 

 

 



1 

 1 





 

 



0.25 

 .50 

 3 

 8 



3.75 



8.5 



2.5 



6.6 



4.5 



3.6 



4.8 



12.0 



5.2 



21.6 



21.0 



11.4 



20.6 



15.0 

 16.2 

 13.2 

 15.8 

 9.8 

 14.0 

 11.4 

 9.2 

 13.0 

 6.4 

 12.6 

 9.2 

 5.4 

 5.6 

 4.4 



1 



2 



23 



22 



30 



44 



7 







21 



4 



4 



5 



31 



23 



29 



" 30 



28 



23 

 19 

 30 

 21 

 30 

 15 

 17 

 30 

 10 

 11 

 36 

 20 

 16 

 13 

 20 



1 



15 - 



22 . . 





 1 



29 



3 



Sept. 5 . s 



5 



12... 



11 



21. 



4 



Oct. 7 







23 . 







Nov. 2 



2 



10 . 



4 



17 



9 



23 . 



8 



Dec. 5 



10 



13. . . 



23 



20 



3 



27... 



14 



1923 

 Jan. 3 



10 



10 



16 



17 . 



12 



24 



13 



Feb. 1 



4 



7 



18 



14 







21 



17 



28 



22 



Mar. 7 



12 



)4 







21 



33 



28 



20 



Apr. 4 



24 



11 



22 







60776—261- 



