LIST OF ILLUSTRATIONS Xlll 



FACING PAGE 



Map Showing Spread of Cotton Boll Weevil from 1892 



to 1912 97 



(Bureau of Entomology, U. S. Department of Agri- 

 culture) 



A Young Cotton Plant Dying from Wilt ...... 98 



(Office of Plant Pathology, B. P. L, U. S. Department 

 of Agriculture) 



A Typical Plant of Dillon Wilt-resistant Cotton . 99 

 (Office of Plant Pathology, B. P. L, U. S. Depart- 

 ment of Agriculture) 



A Field of Upland Cotton in South Carolina Destroyed 



by Wilt 102 



(Office of Plant Pathology, B. P. /., U. S. Depart- 

 ment of Agriculture) 



Wilt-resistant Dillon Cotton on Adjoining Land Badly 

 Infected with Wilt . ^ . . . . . .' . . 102 



(Office of Plant Pathology, B. P. L, U. S. Depart- 

 ment of Agriculture) 



Moths of Cotton Boll-worm . . . . ... . 103 



(Bureau of Entomology, U. S. Department of Agri- 

 culture) 



Pupa of Boll-worm in Its Underground Burrow . . 103 

 (Bureau of Entomology, U. S. Department of Agri- 

 culture) 



Stages and Work of the Cotton Worm or Cotton Cater- 

 pillar . . . . 104 



(Bureau of Entomology, U. S. Department of Agri- 

 culture) 



Cotton Plant Attacked by Boll Weevil .... 105 



Cotton Boll-worm on Outside and Inside of Cotton Boll 108 

 (Bureau of Entomology, U. S. Department of Agri- 

 culture) 



