240 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 11 
Table Showing Catches in Light Trap in Seed Store* at Alexandria, September 1-17. New Seed op 1917 Crop 
Began to Arrive in this Store August 15 
Date, 1917, Morning of 
Number of Moths 
Windows Open or Closed at Night 
September 1 
32 
September 2 
265 
September 3 
September 4 
191 
Open 
September 5 
184 
Open 
September 6 
318 
Open 
September 7 
943 
Closed 
September 8 
2,470 
Closed 
September 9 
4,500 
Closed 
September 10 
7,960 
Closed 
September 11 
5,500 
Closed 
September 12 
8 
Closed 
September 13 
6,060 
Closed 
September 14 
5,760 
Open 
September 15 
2,800 
Closed 
September 16 
September 17 
5,500 
Open 
* The windows in this seed store were open all day and every day for ventilation. They were closed at night, all 
through the summer, until September 4. 
in which they pass a period of time, varying greatly in length, after 
which they come out and spin the ordinary cocoon in which the pupa 
is formed. 
In the early part of the season nearly all the larvae proceed at once 
to pupate and complete their development. As the season advances 
an increasing number of them enters the resting stage until, at the end 
of the season, nearly all follow this course. 
It is in the resting stage that the insect passes through the winter 
or through the period between one crop of cotton and the next, and 
it is consequently in this condition that it offers the best opportunity 
for methods of control to be applied. 
The eggs are very small and inconspicuous, and the egg stage is 
short, the larvae spend all their existence within the tissues of the plant, 
the pupa is small, well hidden, and occupies a short period of time and 
the moths are very difficult to find even when they are very abundant. 
None of these stages offer any satisfactory opportunity for control 
methods except during that part of the larval life which is called the 
resting stage. 
Resting-stage larvae are mostly to be found within the cotton seeds. 
These seeds may be in the seed cotton which is removed from the 
field as the crop, or they may be in the seeds in bolls which are left 
attached to the plants or scattered on the ground after the crop is 
removed. Often two or more seeds are fastened together by the larva 
in such a way as to allow of its passage from one to another. The 
presence of “double” seeds is a sure indication of attack by the pink 
bollworm, but many resting larvae occur in single seeds. Double seeds 
are found in the seed cotton, in cotton seed, and in the bolls left in the 
field after the crop is harvested. 
