APPLYING MATERIALS 



343 



tree as must be done if the outer parts are covered first. In 

 using a gun, it is absolutely necessary to get under large trees 

 to do a good job; in using an extension rod with an angle nozzle, 

 the operator may move about the exterior circumference of the 

 head, spraying inward and upward. 



Air is seldom completely still in the orchard. The side 



(Caterpillar Tractor Co.) 



Fig. 129. Both men are spraying from the ground but do not work 

 on the same tree at the same time. This is a good outfit for hilly land. 

 The power is from the tractor. This is a Virginia scene. 



where the operator must spray against the wind is the most 

 difficult to cover. The operator should direct the spray through 

 the tree, making certain that the material carries well through 

 to the opposite side. The back sweep of the wind will insure 

 coverage of the windward sides of the leaves and fruit. To 

 spray only with the wind means that only the surfaces on the 



