STUDIES OF THE PLNK BOLLWORM IN MEXICO 
Table 6. — Soil examinations for pink bollworms, 1921 cotton fields 
Date examined 
Number 
of 
square 
yards 
examined 
Living stages found in soil 
Dead 
larvae 
and 
pupae 
Pupal 
cases 
Larvae 
Pupae 
Total per 
square 
yard 
July 21.. 
1921 
4 
9 
5 
1 
74 
5 
7 





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 
85 
Sept. 6 
1 1 44 
1 ! 12 
1 2 
1 5 
5 
25 
7 
Oct. 18 
41 
29 
12 
Nov. 28.... 
27 
2 
Dec. 16 
14 
5 
5 
5 
5 
5 
5 
5 
5 
5 
5 
11 
13 
Jan. 3.. 
1922 
15 | 
10 j 
15 
4 n 
10 
20 
9 
Feb. 6 
5 
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 
.Time 12 
2 
26.. 
5 
July 10. 


1 
24 





Aug. 8 _ _ 
1 
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 
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 
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 
5 
5 
1 
1 
11 

1 
l 
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 , 
31 1 
3 
Sept. 5 
14 
31 
10 
15 
11 
3 
4 
10 
52 
108 
102 
57 
103 
75 
81 
66 
79 
49 
70 
57 
45 
65 
32 
62 
45 
27 
28 
22 
1 
3 

7 
4 





3 







2 

1 


1 
1 



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 
6 
21.. 
17 
28 
22 
Mar. 7. 
12 
14 
9 
21 -_- ..,- 
33 
28. 
20 
Apr. 4 
24 
11 
22 
60776— 26f- 
