PREFACE 



In the present work we have attempted to bring together in 

 concise and usable form what is known in regard to the habits, 

 Hfe history and control of the insect enemies of vegetable-garden 

 crops in the United States and Canada. Much of this uifor- 

 mation has been published in technical journals and in the 

 bulletins and circulars of the State Experiment Stations and 

 Federal Government, where it is available only to the special 

 student who has access to the few large libraries that collect 

 and preserve this type of literature. We have endeavored 

 thoroughly to digest this mass of material and present it in a 

 form adapted to the needs of the gardener and vegetable- 

 grower. 



In regard to methods of control we have tried to eliminate 

 as far as possible useless and impracticable recommendations 

 and include only those found to be effective under commercial 

 conditions or such as w^ould seem to be worthy of trial. It has 

 seemed better to state frankly that the problem of control in 

 certain cases has not been solved than to suggest remedies that 

 would lead to disappointment. 



The chapter on cutworms and the accounts of several others 



of the lepidoptera were written in collaboration with Dr. 



Robert INIatheson. We are under great obligation to Dr. W\ T. 



M. Forbes for criticism and aid with the lepidoptera ; to Dr. 



E. C. Van Dyke for the determination of beetles ; to Mr. Charles 



vii 



