10 BULLETIN 1397, U. S. DEPARTMENT OF AGRICULTURE 
Table 1. — Longevity of resting larvce of the pink hollworm 
Country 
Authority 
Conditions under which kept 
Longevity 
Egypt 
Oough 1 
Stored seed 
Months 
27 
Do 
do.i 
do 
16 
Do 
Ballou* 
...do 
24 
Do 
Do 
do.' 
do. 4 
do 
do 
30 
31 
Do 
Willcocks J 
Busck « 
Loftin, McKinney, and Hanson 7 
Ohlendorf* 
Unpublished 9 
Natural conditions 
22 
Stored seed ... 
18 
do.... 
12 
Do 
Stored bolls". 
Over 16 
Do 
Stored bolls 
16% 
1 (9, p. 9.) 
HI, P- H.( 
3 0, P. 16.) 
* (2, p. 264.) 
• (21, p. 154.) 
• (S, p. 356.) 
7 04, P- 16.) 
8 07, P. 10.) 
9 Unpublished manuscripts, U. S. Department of Agriculture. 
10 Resting larvae in stored seed lived 15 months. 
After a variable time, as has been indicated, the larva transforms 
into a pupa or chrysalis. The pupal stage lasts from 6 to 20 days, at 
the end of which the moth emerges. The life of the moth is rather 
Fig. 9. — Typical holes made by pink bollworms through cotton-boll carpels 
short. Under favorable conditions Busck succeeded in keeping 
some specimens alive for 32 days, but under the same conditions the 
great majority of the insects died in from 14 to 20 days. 
The moth is seldom seen in nature. It habitually hides during the 
day under stones or brush. The normal time of flight is from 
6.30 to 8 p. m. Although apparently capable of prolonged flight, 
the moths prefer to go no farther than the first cotton field. They 
are so quiet in their habits and so easily overlooked that many may 
occur unnoticed in the field. 
