﻿Bui. 19, U. S. Dept. of Agriculture. 



Plate III. 



Fig. 1.— Rod and Single Cyclone Nozzle Used to Apply Spray to Underside of 

 Grape Foliage. Power Supplied by Tractor Sprayer. Vineyard of Mr. H. H. 

 Harper, North East, Pa. (Original.) 



Fig. 2.— Gasoline-Engine Sprayer Supplying Power for Two "Trailer" Leads 

 of Hose in Spraying Against the Grape Leafhopper. Vineyard of Mr. J. E. 

 Beatty, North East, Pa. (Author's Illustration.) 



THE GRAPE LEAFHOPPER. 



