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. 
