6 BULLETIN 723, U. S. DEPARTMENT OF AGRICULTURE. 
ing. The percentage of germination is naturally low and much 
larger quantities must be planted to secure a stand. 
It is evident from what has been said that the pink bollworm 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. 
The most accurate information concerning the damage by the 
pink bollworm is in a recent paper by L. H. Gough (T). This in- 
vestigator conducted studies in lower and middle Egypt to determine 
the number of bolls attacked by the pink bollworm. The samples 
consisted each of 100 green bolls taken at random in fields in various 
localities. These samples were sent to Cairo where they were given 
a very careful examination. The total number of bolls examined in 
w* "H 
I s^ _ 
I tJSkm 
i- m-^JL - 
Fig. 1. — At left, normal cotton boll ; at right, boll injured by the pink bollworm. 
this work was 106,400, and the examinations were continued from 
July to November. The following are the results of this investiga- 
tion: 
Percentage infested during July, less than 10. 
Percentage infested during August, from 10 to 25. 
Percentage infested during September, from 25 to 75. 
Percentage infested during October, from 75 to 89. 
These figures show in a very striking manner the great damage of 
which the pink bollworm is capable. They may be taken as a fair 
indication of the injury which would be done in the United States, 
as the seasonal conditions here are similar to those in Egypt. In 
short they show that approximately 25 per cent of August bolls and 
50 per cent of the September bolls would be destroyed or rendered 
