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 
190? 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. 
WASH] NGTOH 
GOVERNMENT PRINTING OFFICE. 
1910, 
