THE PINK BOLI.WORM 
13 
lower than normal by about 20 per cent, and that the oil actually 
obtained was dark in color and of comparatively low value. The 
work of the insect is also of importance in connection with seed for 
planting. The percentage of germination is naturally low and 
much larger quantities must be planted to obtain a stand. 
From what has been said it is evident that the pink boll worm 
must be of interest to all classes of persons* concerned in the cotton 
trade as well as to those engaged more especially in the cultivation 
of the crop and the utilization of the seed. 
Accurate information concerning the damage by the pink boll- 
worm in Egypt is contained in a paper by L. H. Gough {10). 
This investigator conducted studies in lower and middle Egypt to 
determine the relative number of bolls attacked by the pink boll- 
worm. Samples, each of 100 green bolls taken at random in fields 
in various localities, were sent to Cairo, where thev were iriven 
* 
Fig. 10. — At left, normal cotton boll ; at right, boll injured by the pink bollworm 
very careful examination. The total number of bolls examined was 
more than 106,400, and the examinations were continued from July 
to Xovember, 1916. The following are among the results of this 
investigation : 
Percentage infested during July, less than 10. 
Percentage infested during August, from 5 to 25. 
Percentage infested during September, from 25 to 75. 
Percentage infested during October, from 75 to 85. 
These figures show in a very striking manner the great damage of 
which the pink bollworm is capable, and may be taken as a fair indi- 
cation of the injury which would be done in the United States if it 
were allowed to spread here, as the seasonal conditions here are 
similar to those in Eg} T pt. In short, they show that approximately 
20 per cent of the August bolls and 50 per cent of the September bolls 
would be destroyed or rendered practically valueless by the insect. 
They further illustrate the rapid increase of infestation of green 
