36 



operation. The hose should be one-half inch in diameter, 

 inside measure, and of at least four-ply stock. Such hose 

 may be secured of some of the firms mentioned at from 

 12 to 15 cents per foot. The best hose is not liable to 

 burst under the pressure from the pump and will last 

 much longer than cheaper grades. The length of hose 

 usually furnished by manufacturers with their pumps is 

 too short for satisfactory use. About 25 feet is a good 

 working length for each line as it allows the sprayers 

 more range and insures more rapid and more thorough 

 work which more than offsets the slight extra cost for the 

 longer hose. Each line should be provided with an ex- 

 tension rod from 6 to 12 feet long according to the size 

 of the trees to be treated. There should be two "cut- 

 offs" for each line of hose : one between the pump and the 

 hose and the other between the hose and the extension 

 rod. These save time and liquid and it is more economical 

 to have them than to work without them. 



The kind of nozzle to be used is a very important mat- 

 ter. That throwing the best spray is known as the "dou- 

 ble Vermorel." There are several types of this nozzle 

 made by various manufacturers which accomplish very 

 similar results. One of these is shown in fig. 4. The 



Fig. 4. 



nozzle should be provided with plungers to clean them 

 when they become clogged as is liable to happen occasion- 

 ally even if the wash has been properly strained. The 

 nozzle caps for Lime-Sulfur work should have an open- 

 ing of 1-16 inch and extra caps should be kept on hand 

 to replace old ones when they become worn so that they 

 throw too coarse a spray. The pressure from the pump 

 should be kept strong and especially when four nozzles 



