ILLUSTRATIONS 



PLATES. 



Page. 



Plate I. Spraying against the grape leafhopper. 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. Fig. 2. — Rod carrying two cyclone nozzles used 

 to apply spray to underside of grape foliage. Power supplied by 



compressed air. Vineyard of Mr. A. I. Loop, North East, Pa 4 



II. Comparison of sprayed and unsprayed plats. Fig. 1. — Showing con- 

 dition of vine injured by grape leafhopper in unsprayed plat. 

 Note loss of foliage and also berries from clusters. Vineyard of 

 Mr. W. E. Gray, North East, Pa. Fig. 2. — Showing condition of 

 vine in plat sprayed with tobacco extract No. 1 against grape leaf- 

 hopper. Note larger size of berries in clusters, heavy foliage, and 

 stronger cane growth. Vineyard of Mr. W. E. Gray. North East, 

 Pa 8 



III. Spraying against the grape leafhopper. Fig. 1. — Gasoline engine 



sprayer supplying power for two "trailer" leads of hose in spraying 

 against grape leafhopper. Vineyard of Mr. J. E. Beatty. North 

 East, Pa. Fig. 2. — Gasoline-engine sprayer supplying power for 

 two "trailer" leads of hose in spraying against grape leafhopper. 

 Vineyard of Peacock-Rood Co., Westfield, N. Y 8 



IV. The grape-berry moth (Polychrosis viteana). Figs. 1, 2. — Adult or 



moth. Fig. 3. — Full-grown larvae. Fig. 4. — Pupae 16 



V. Injury to grapes by larvae of first brood of the grape-berry moth. 

 Fig. 1. — Showing destruction of portion of grape cluster as a result 

 of boring of larva into stem. Fig. 2. — Showing cracking of infested 

 berries and also the way in which berries first attacked are secured 

 by web to berries which are attacked later in the development of 



the larva 24 



VI. Injury to grapes by larvae of second brood of the grape-berry moth. 

 Fig. 1. — Showing clusters of Concord grapes from which infested 

 berries have been removed. Fig. 2. — Injury to berries by larvae 



just previous to harvesting of fruit 24 



VII. Outdoor rearing shelter and cage used in life-history studies at North 

 East, Pa. Fig. 1. — Portion of outdoor shelter used in the rearing of 

 insects during 1909. Fig. 2. — Cage built over grapevines in which 

 the generations of the grape-berry moth were reared during 1909. . 32 

 VIII. Spraying against the grape-berry moth. Fig. 1. — Showing size of 

 grape berries at second spray application about the time many of 

 the first-brood eggs of the grape-berry moth are deposited on them. 

 Fig. 2. — Trailer method of vineyard spraying in order to apply the 

 spray to the underside of the foliage or to the grape clusters where 



the foliage is dense 60 



IX. Fig. 1. — Cherries injured by the cherry fruit sawfly (Hophcamj a 

 coolcei). Fig. 2. — Entrance and exit holes of the cherry fruit saw- 

 fly 76 



