INSECTS INJURIOUS TO THE GRAPE 



507 



the rate of 4 pounds to the barrel as soon as feeding marks 

 are found on the foliage, and again a week or ten days later, and 

 should be added to the Bordeaux mixture used for the diseases 

 of the vine. The sprayic must be done with the greatest 

 thoroughness, as the beetles dislike the sprayed foliage and will seek 

 out that which has been missed. The nozzles on traction outfits 



FIG. 365. A geared horse-power vineyard sprayer. This is provided with 

 a compressed air tank and an extra nozzle on each side directed down- 

 ward in order to spray the tops of the vines. (After Quaintance and 

 Shear, U. S. Dept. Agr.) 



should therefore be arranged so as to hit all parts of the vines (see 

 Figs. 365, 366) and the pump should maintain at least 100 pounds 

 pressure. With the machines in common use not over 7 or 8 

 acres a day may bo covered thoroughly, and about 125 gallons 

 will be required per acre. If the work is hurried to cover greater 



