194 TREES AS GOOD CITIZENS 



will be thrown into spray as it reaches their tops and will 

 then descend as a mist over the tree. 



For the most extensive spraying operations motor 

 truck sprayers are sometimes used. 



Accessories for Spraying. There are many types of 

 spraying nozzles, but the one which has been found 

 most generally efficient, for both medium and small 

 outfits, is the whirlpool disc type, adjustable to fine, med- 

 ium or coarse spray. This nozzle is compact and does 

 not catch in branches or twigs. 



For reaching the upper and inner parts of a tree, where 

 a mist spray is used, an extension rod is useful. This is a 

 rod of aluminum, iron or brass, fitted into a bamboo pole, 

 made in lengths of from 6 to 14 feet, and is used for hold- 

 ing the nozzle above the head of the operator. 



A combination of nozzle and extension rod is the 

 Worthley nozzle, several feet in length, which directs a 

 solid stream and makes it possible to reach the top of an 

 85 foot tree while the operator is standing on the ground. 

 For foliage nearer the ground and for small trees the 

 nozzle has a spreader which breaks the force of the solid 

 stream and produces a fan-shaped spray. 



For the larger power outfits and heavier work a nozzle 

 like that used on a fire hose, but of smaller size, is best. 



The hose used in spraying should be of the best grade, 

 made for high pressure and from ji to ~% inch inside 

 diameter. 



In the absence of spraying equipment, a common 

 paint or whitewash brush may be used to good advantage 

 in applying treatment to the trunk and larger branches 

 of a single tree, or even a small number of trees. This 

 method is used against the scale insects, and the spray 

 material is spread on the bark with the brush. Even the 

 caustic lime-sulphur may be thus applied if proper pre- 



