U. S. DEPARTMENT OF AGKICULTURE^J 9l0 
BUREAU OF ENTOMOLOGY — BULLETIN NO. «9. • U J - rf ^ 
L. O. HOWARD. Entoraolo«i»t and Chief of Bureau. 
THE GRAPE ROOT-WORM 
WITH ESPECIAL REFERENCE TO INVESTIGATIONS 
IN THE ERIE GRAPE BELT PROM 
1901 TO L909, 
BY 
FRED JOHNSON and A. G. HAMMAR, 
Engaged in Deciduous Fruit Insect Investigations. 
IN COOPERATION WITH TITE OFFICE OF TIIE STATE ZOOLOGIST, 
PENNSYLVANIA DEPARTMENT OF AGRICULTURE. 
Issued October 2(5, 1910. 
\Y A SHI NO TON : 
GOVERNMENT PRINTING OFFICE. 
1910. 
