54 



DECIDUOUS FRUIT INSECTS AND INSECTICIDES. 



A third and upper nozzle is mounted on a longer spur which projects 

 over the trellis. This nozzle is directed downward, throwing the 



spray upon the top- 

 most growth on the 

 trellis. Such a ma- 

 chine carrying a 

 pressure of 100 pounds 

 and over will force the 

 spray into the vines on 

 the trellis and cover 

 quite thoroughly all of 

 the foliage and fruit 

 clusters, especially 

 during the early part 

 of the season before 

 the foliage has become 

 dense and before the 

 berries in the cluster 

 have become so large 

 that they touch each 

 other. 



In this experiment 

 the team was driven 

 slowly down each row 

 so that the vines were 

 sprayed from both 

 sides of the trellis. A 

 pressure of about 100 

 pounds was main- 



Fig. 19.— Gasoline-engine sprayer outfit used in vineyard experi- tained and about 100 

 ments against the larvae of the grape-berry moth in the vineyard 

 of Mr. W. S. Wheeler, North East, Pa., 1907, 1908, and 1S09. gallons of Spray Were 



applied per acre. 

 Table XXII gives the spray treatment applied to each plat and 

 also dates of application. 



Table 



XXII. — Spray formulas and dates of application against larvae, of the grape-berry 

 moth. Vineyard of Mr. W. $. Wheeler, North East, Pa., 1907. 



Plat 



No. 



Spray formula. 



Number 

 of spray 

 applica- 

 tions. 



Date of application. 



I. 

 II. 



III. 



IV. 



V. 



VI. 



Three pounds arsenate of lead to 50 gallons of Bordeaux mixture 

 Three pounds arsenate of lead and 2 pounds resin-fish-oil soap 



to 50 gallons of Bordeaux mixture. 

 One quart arsenite of lime, Kedzie's formula, and 2 pounds 



resin-fish-oil soap to 50 gallons of Bordeaux mixture. 

 One quart arsenite of lime, Kedzie's formula, to 50 gallons of 



Bordeaux mixture. 

 One quart arsenite of lime, Kedzie's formula, and 2 pounds 



resin-fish-oil soap to 50 gallons of Bordeaux mixture. 

 Unsprayed 



3 

 3 



3 

 Ti 



3 



2 



June 19, July 8, 27. 

 Do. 



Do. 



Do. 



July 9, 27. 



VII. 



Three pounds arsenate of lead and 2 pounds resin-fish-oil soap 

 to 50 gallons of Bordeaux mixture. 



2 



Dc. 



