THE GRAPE LEAFHOPPER IN THE LAKE ERIE VALLEY. 47 
1910. Hartzell, F. Z. N. Y. Agr. Exp. Sta., Geneva, Bui. 331, pp. 568-579. 
''The grape leaf-hopper ( Typhlocyba comes Say)." Economic importance, injury to grape- 
vines. Brief description, seasonal history. Remedy: Black-leaf tobacco extract. Records of 
/ineyard experiments* 
1911. Johnson, Fred. U. S. Dept. Agr., Bur. Ent., Bui. 97, Pt. I. 
"Spraying experiments against the grape leaf-hopper in the Lake Erie Valley." Brief dis- 
cussion of life history, habits, and injury to grapevines. Remedies: Tobacco extracts. Record 
of spraying experiments in vineyards. 
1912. Hartzell, F. Z. N. Y. Agr. Exp. Sta., Geneva, Bui. 344. 
" The grape leaf-hopper and its control. " Life history, injury to grapevines, species and varie- 
ties found in Chautauqua County, food plants, control experiments, automatic spraying attach- 
ment, spraying recommendations. 
1912. Sanderson, E. D. Insect Pests of Farm, Garden and Orchard, pp. 520-523. 
New York. 
" The grape leaf-hopper ( Typhlocyba comes Say)." Life history, injury, remedies. 
1912. O'Kane, W. C. Injurious Insects, pp. 311-313. 
"The grape leaf-hopper ( Typhlocyba comes Say)." Life history, habits, injury to grapevines, 
remedies. 
1912. Johnson, Fred. U. S. Dept. Agr., Bur. Ent,. Bui. 116, Pt. I. 
"Spraying experiments against the grape leafhopper in the Lake Erie Valley in 1911." 
Results of vineyard experiments with tobacco extracts, giving method and cost of application 
and results in crop yield. 
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