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UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 416 



Contribution from the Bareau of Entomology 

 L. O. HOWARD, Chief 



Washington, D. C. 



PROFESSIONAL PAPER 



January 29, 1917 



THE RED SPIDER ON COTTON 



By 



E. A. McGregor and F. L. Mcdonough 



Scientific Assistants 



CONTENTS 



Page 



Zonal Distribation in the Southeast . . 2 



Classification and Synonymy 3 



Food Plants 4 



Life-History Summary • 5 



Description and Habits 6 



Nature and Extent of Damage to Cotton 



in the South 20 



Generations of the Red Spider .... 21 



Seasonal History 23 



Dispersion 27 



Climatic Control 33 



Insect Enemies of the Red Spider ... 34 



Apical Swarming 58 



Remedial Measures 69 



Summary and Recommendations ... 67 



Bibliography 69 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 



1917 



