SPRAYING AND DUSTING APPARATUS 69 



Power Outfits. For orchards of much over 500 trees or for 

 extensive shade-tree work a gasoline power outfit is more econom- 

 ical and enables a large area to be covered more quickly, which is 

 often a most important consideration. Most of the pump manu- 

 facturers and many gas engine companies are selling such outfits 

 mounted upon a truck, with spray tank, and tower complete for 

 from $250 to $400. 



Traction Sprayers. For a small acreage of potatoes or other 



FIG. 40. A good type of geared sprayer for row crops. 



row crops, a barrel pump with row attachment is very satisfac- 

 tory, but for any considerable acreage, a two-wheeled traction 

 sprayer is much more economical of labor and time which are 

 the two chief items in the cost of spraying. Such traction 

 sprayers are made of widely different types, the power in all 

 cases being furnished by a gear or chain which operates the pump 

 from the wheels. The mechanical construction of the traction 

 sprayers should be carefully studied, and if possible tested, before 



