STUDIES OF THE PINK BOLLWORM 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 soil underneath, to the depth of 6 inches, were made, with 
results as given in Table 8. 
Table 
-Entrance of pink bollworm larvae from bolls on the surface of the soil 
into soil for hibernation 
Date examined 
Found in bolls 
Larvae and pupae- 
Living Dead 
Pupal 
Found in soil 
Larvae and pupae — 
Living 
Dead 
Pupal 
cases 
Nov. 28i 
1922 
Dec. 5. 
11. __ 
18 
25 
Jan. 8 
1923 
22 
Feb. 5 
20 
Mar. 5 .. .. 
19 
Apr. 2 
Averages . 
228 
162 
152 
144 
125 
143 
120 
76 
65 
2 30 
19 
5 
30 
43 
2 55 
60 
43 
94 
34.7 
2.3 
19.5 
2.0 
131.6 
21.5 
1 This represents examination of bolls at start of experiment, as a check, and is not included in averages. 
2 Only 97 bolls 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 the 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 larvx from bolls on stalks into the soil for 
hibernation 
Found in bolls 
Found in soil 
Date examined 
Larvae and pupae- 
Pupal 
cases 
Larvae and pupae- 
Pupal 
Living 
Dead 
Living . 
Dead 
cases 
1922 
Nov. 28i 
228 
227 
279 
285 
232 
248 
133 
130 
136 
131 
129 
13 
20 
7 
9 
13 
17 
11 
12 
5 
6 
5 
1 
Dec. 7 
4 
3 
2 
7 
6 
I 
19 



2 

1923 
Jan. 1 

16. 

30 
n 
Feb. 13 
22 4 
15 J 3 
24 4 
48 3 
29 2 
Ant nest in soil CnoHarvae") 
27 
1 

3 
1 1 
Mar. 13... 

27 
! 
Apr. 10 
2 1 
Averages 
/ 193 
20.4 ! 4.5 
3.1 1 0.6 
217.9 
6. 1 
1 This represents an examination of bolls at the start of the experiment, as a check, and is not included 
in the averages. 
