UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 564 



Contribution from the Bureau of Entomology 

 L. O. HOWARD, Chief 



Washington, D. C. 



October 4, 1917 



COLLECTION OF WEEVILS AND 



INFESTED SQUARES AS A MEANS OF CONTROL 



OF THE COTTON BOLL WEEVIL IN 



THE MISSISSIPPI DELTA 



* By 



ft R. COAD and T. F. McGEHEE, Entomological Assistants 

 Southern Field Crop Insect Investigations 



CONTENTS 



Page 

 General Statement of Experiments Con- 

 ducted 1 



Time Interval between Bag-and-Hoop 

 Collections in Relation to Proportion of 

 Infested Forms Secured 3 



Plat Tests of the Value of the Bag-and- 

 Hoop as a means of Weevil Control 

 under Field Conditions 18 



Studies on the Value of a Mechanical Col- 

 lector of Boll Weevils 37 



General Considerations and Summary . 42 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1917 



