6 BULLETIN 723, U. S. DEPARTMENT OF AGEICULTUEE. 



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 Egj^pt 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 ver}' careful examination. The total number of bolls examined in 



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 .Tulj% less than 10. 



Percentage infested during August, froin 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 injurj' which would be done in the United States, 

 as the seasonal conditions here are similar to those in Egj-pt. 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 



