PLANTING AND CARE OF TREES 



181 



desirable. Those of the disc type are best suited to the purpose. 

 AVhen it is required to throw a stream high into the air a nozzle 

 of either the ^'Long Distance" or the Bordeaux type will be found 

 most useful. The "Long Distance" nozzle may be acQusted so 



Fig. 98 An inexpensive 

 Spraying- Outfit for small 

 trees and shrubs. 



Fig. 99. The Bordeaux Nozzle 

 commonly used in spraying 

 shade trees. It may be adjusted 

 to trow either a straight stream 

 or a fan-shaped spray, 



as to regulate the size of the stream. The Bordeaux type (fig. 99) 

 may be regulated so as to produce either a straight stream or a 

 fan-shaped spray. 



To avoid troublesome "blow-outs" it is well to use long shank 

 couplings and two clamps on each section of the coupling. 



Rubber hose of the best quality is necessary for high-pressure 

 worlv. The half -inch size is sufficient for close work^ but for long 

 distance work it is better to use a larger size. It should be strong 

 enough to stand a pressure of at least two hundred pounds, al- 

 though for close work it is seldom necessary to maintain a pressure 

 of more than one hundred and twenty-five pounds. 



Most spraying outfits are supplied with mechanical agitators to 

 insure the discharge of the mixture at uniform strength. On hand 

 outfits they are usually attached to and operated with the handle 

 of the pump. Such agitators seldom furnish sufficient agitation, 

 especially when there is only one nozzle in operation and the 

 handle is necessarily moving slowly. For the spraying of aresnate 

 of lead that quickly settles, it is safer to use an old garden hoe 

 with which the man who operates the pump may keep the mixture 



