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



Plate II. 





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Fig. 1.— Injury by Grape Leafhopper (Typhlocyba comes) to Unsprayed Vines. 



(Original.) 



Fig. 2.— Perfect Foliage of Sprayed Vines. Views from Experimental Plats 

 in Vineyard of Mr. H. H. Harper, at North East, Pa. (Original.) 



