GIPSY MOTH AND BROWN-TAIL MOTH. 19 



is unnecessary to climb trees and use small lines of hose, which is a 

 slow and expensive operation. A satisfactory high-power sprayer 

 (Fig. 10) for this work should be equipped with a 10-horsepower 

 gasoline engine and a triplex pump capable of delivering 35 gallons of 

 liquid per minute at a pressure of from 225 to 350 pounds. This 

 machinery, together with a 400-gallon tank, should be mounted on 

 well-built trucks. One-inch hose is used, and by slightly increasing 

 the pressure at the machine the spray material can be conducted 

 through several hundred feet of this hose with the outfit mentioned 

 without seriously reducing the nozzle pressure, which should be 

 maintained at about 225 pounds. 



By using a small device, which is attached to the nozzle and is 

 known as a spreader, it is possible to spray low growth very satisfac- 

 torily. Fruit trees can be treated very rapidly in this way (Fig. 12). 



HAND METHODS TO BE USED AGAINST THE GIPSY MOTH IN 



ORCHARDS. 



The methods to be used for controlling the gipsy moth hi orchards 

 should be determined largely by the severity of the infestation. If only 

 a few egg clusters are present in the orchard, early spraying, such as is 

 applied for the codling moth after the blossoms have fallen, will be found 

 useful, providing the amount of poison used is increased to 10 pounds 

 to 100 gallons of water. If the infestation is more serious, a second 

 spraying early in June, using a similar amount of poison, will be 

 found very satisfactory. In cases where the infestation is severe it 

 probably will be necessary to creosote egg clusters in the winter and 



FIG. 10. High-power sprayer. 



