\^ 1 V . iMOJUV/l « 



HOW TO DETECT OUTBREAKS OF 



INSECTS ANO SAVE THE 



GRAIN CROPS 



W. R. WALTON 



Entomologist in Charge of Cereal and Forage Insect Investigations 



A billbiig, much enlarged 



FARMERS' BULLETIN 835 

 UNITED STATES DEPARTMENT OF AGRICULTURE 



Contribution from the Bureau of Entomology 

 L. O. HOWARD, Chief 



Washington, D. C. 



Additional copies of this bulletin may be obtained free from the 

 Division of Publications, U. S. Department of Agriculture 



WA$HINQTON : QOVERNMENT PRINTINQ OFFICE 



