THE CORN ROOT-APHIS AND 

 METHODS OF CONTROLLING IT 



JOHN J. DAVIS 



Entomological Assistant, Cereal and Forage 

 Insect Investigations 



Winged female of corn root-aphis (form that produces living 

 young). Greatly enlarged 



FARMERS' RULLETIN 891 

 UNITED STATES DEPARTMENT OF AGRICULTURE 



Contribution from the Bureau of Entomology 

 L. O. HOWARD, Chief 



Washington, D. C. 



December, 1917 



Show this bulletin to a neighbor. Additional copies may be obtained free from the 

 Division of Publications, United States Department of Agriculture 



WASHINQTON : QOVERNMENT PRINTINQ OPFICB : Itll 



