IEEUS ERAT TONS: 
PLATES. 
Pirate I. Fig. 1—Cover crop of vetch in vineyard of Mr. John Higgins, North 
East, Pa Fig. 2.—Cover crop of turnips in vineyard of Mottier 
Bros., North East, Pa.; vineyard badly infested by grape leafhop- 
per, which was effectively treated with blackleaf tobacco-extract 
SPIAy . - sesso bbe aS eee aoe nee e SER ee ee 
II. Fig. 1.—Injury by grape leafhopper ( Typhlocyba comes) to unsprayed 
vines. Fig. 2.—Perfect foliage of sprayed vines. Views from ex- 
perimental plats in vineyard of Mr. H. H. Harper, at North East, 
TEXT FIGURES. 
Fic. 1.—The grape leafhopper ( T'yphlocyba comes var. coloradensis): Adult... - - 
2.—The grape leafhopper: Nymph of the first molt. -.........-....----- 
3.—The grape leafhopper: Fully developed nymph of the fifth molt... .-. 
4.—Grape leaf in early stages of attack by the grape leafhopper, showing 
the characteristic mottling of the upper surface..........-...-.----- 
5.—Grape leaf showing final result of attack by the grape leafhopper; leaf 
withered and brown before the fruit is mature........-.----------- 
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