UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 918 



Contribution from the Bureau of Entomology, L. O. HOWARD, Chief 



in collaboration with the Federal Horticultural Board 



C. L. MARLATT, Chairman 



Washington, D. C. 



PROFESSIONAL PAPER 



April 19, 1921 



REPORT ON INVESTIGATIONS OF THE PINK 

 BOLLWORM OF COTTON IN MEXICO 



By 



U. C. LOFTIN, Entomological Assistant, K. B. McKINNEY, 



Scientific Assistant, and W. K. HANSON, 

 Plant Quarantine Inspector 



CONTENTS 



Page 



The Laguna District 1 



Distribution of the Pink Bollworm .... 4 



Life History 5 



Seasonal History 19 



Feeding Habits of Larv® 21 



Damage Caused by the Pink Bollworm . 24 



Food Plants 32 



Page 



Dispersal , 34 



Natural Control 38 



Repression 47 



Summary 56 



Literature Cited 57 



Appendix 58 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1921 



