U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ENTOMOLOGY— BULLETIN NO. 89. 



L. O. HOWARD. Entomologist and Chief of Bureau. 



THE GRAPE ROOT-WORM 



WITH ESPECIAL REFERENCE TO INVESTIGATIONS 



IN THE ERIE GRAPE BELT FROM 



1907 TO 1909. 



BY 



FRED JOHNSON and A. G. HAMMAR, 



Engaged in Deciduous Fruit Insect Investigations. 



IN COOPERATION WITH THE OFFICE OF THE STATE ZOOLOGIST, 

 PENNSYLVANIA DEPARTMENT OF AGRICULTURE. 



Issued October 20, 1910. 



WASHINGTON: 



GOVERNMENT PRINTING OFFICE. 



1910. 



