﻿THE PINK BOLLWORM 



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 bollworm 

 must be of interest to all classes of persona concerned in the cotton 

 trade as well as to thosei 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 they were given 



Fio. 10. — At left, normal cotton boll ; iit 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 November, lOlG. The following are among the results of this 

 investigation : 



I'erooiitu^e infested durinj? July, less than 10. 



Perc-enta^o infested durinj,' AuK'ist, from 5 to 25. 



Perfcntaf,'e infested duriiif,' Sej)lemher, from 25 to 75. 



Percentage infewted during <)(t()ljer, 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 wliich would be done in the United States if it 

 were allowed to .sjjrcad here, as the seasonal conditions here are 

 similar to tiiose in Egypt. In short, they show that approximately 

 20 jjer fent of the August bolls ami 50 per cent of the Sei)ternl)er bolls 

 would he destroyed or rendered pi'aetically valiK'Icss hy (he insect. 

 They furl her illustrate the I'apid increase of infestation of green 



