Bui. 97, Part I, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate I. 



Fig. 1.— Cover Crop of Vetch in Vineyard of Mr. John Higgins, North East, 



Pa. (Original.) 



Fig. 2.— Cover Crop of Turnips in Vineyard of Mottier Bros., North East, 

 Pa. Vineyard Badly Infested by Grape Leafhopper, which was Effec- 

 tively Treated with Blackleaf Tobacco-Extract Spray. (Original.) 



