CONTENTS 



Page. 



lutroduction 7 



Life cycle 8 



The egg S 



The larva 8 



The pupa 8 



The adult 10 



Length of life cycle 10 



Food plants 10 



Seasonal history 11 



Extent of injury 12 



Injury, 1903-1906 12 



Means of control 14 



Cultural methods 14 



Arsenical poisons 10 



Trap crops 18 



Field work, 1905-190(5 20 



Ardmore farm 21 



New Boston farms . 23 



Summary remarks concerning the use of fertilizers . 24 



Injury to field corn 25 



Results of poison experiments 25 



Trap crop experiments 27 



Local extermination 28 



The more important natural factors in bollworm control 29 



Recommendations 31 



290 



(5) 



