PINK BOLLWOKM OF COTTON IN MEXICO. 
19 
dried. Afterward the moth crawls off and hides until dark, if 
issuance has taken place during the day. What course is followed 
when issuance takes place at night was never observed. 
Time of Day Moths Emerge. 
The moths emerge from the pupse at all hours of the day and 
night under laboratory conditions, where the temperature and 
humidity are more or less uniform. From Table VIII it can be seen 
that between the morning examinations and the afternoon exami- 
nations, 421 moths emerged in 134.5 hours, an average of 3.1 moths 
per hour, and that 348 moths emerged between the afternoon exami- 
nations and the morning examinations in 301 hours with an average 
of 1.1 moths per hour. About three times as many moths emerged 
during the day as emerged per hour during the night. 
Table VITI. — Time of day of emergence of the adult P. gossypiella. 
Date. 
Morning exami- 
nation. 
Afternoon exami- 
nation. 
Date. 
Morning exami- 
nation. 
Afternoon exami- 
nation. 
Time. 
Number 
of adults. 
Time. 
Number 
ofadults. 
Time. 
Number 
ofadults. 
Time. 
Number 
ofadults. 
1919. 
May 22 
May 23 
May 24 
May 25 
May 26 
May 27 
May 28 
May 29 
May 30 
May 31 
June 1 
10.00 
9.30 
9.30 
10.30 
9.30 
9.30 
9.30 
9.30 
9.30 
10.00 
10.00 
9.30 
10.00 
0) 
16 
2 
15 
10 
15 
17 
13 
11 
46 
20 
14 
13 
5.25 
5.30 
5.30 
5.30 
5.00 
5.30 
6.00 
8.30 
6.30 
8.30 
6.00 
5.30 
( 2 ) 
27 
5 
17 
25 
27 
26 
13 
19 
25 
16 
15 
42 
( 2 ) 
1919. 
June 4 
June 5 
june 6 
June 7 
June 8 
June 9 
June 10 
June 11 
June 12 
June 13 
Total . 
10.00 
10.00 
10.00 
10.00 
10.00 
10.00 
10.00 
10.00 
10.00 
9.30 
(') 
22 
25 
14 
0) 
0) 
20 
26 
41 
8 
5.30 
6.00 
6.00 
( 2 ) 
( 2 ) 
6.00 
5.00 
5.00 
5.30 
( 2 ) 
9 
19 
20 
( 2 ) 
( 2 ) 
28 
39 
27 
22 
( 2 ) 
348 
421 
June 3 
All removed. 
2 No record. 
SEASONAL HISTORY. 
The data show that moths may emerge at any time during the 
winter or early spring, and so far as known they may begin breeding 
if suitable food plants are found. Cotton does not grow as a peren- 
nial in this section. Sometimes it is left for the second year to pro- 
duce a "zoca" crop, but the plants are dormant during the winter 
and the crop is produced from sprouts sent out from the roots or 
old stalks. Planting may begin during the first part of February, 
but usually begins about the middle, depending upon the season. 
Squares are not formed in any numbers until about the first of May, 
usually a little earlier on the zoca than on the plant cotton. Holly- 
hock, another host plant of pink bollworms, may be in bloom earlier 
than cotton, but it is considered of no economic importance in this 
connection. Repeated attempts to secure oviposition on young 
