108 MISC. PUBLICATION 626, U. S. DEPT. OF AGRICULTURE 



more practical. Such equipment devel- 

 ops higher pressure and holds larger 

 quantities of spray materials. 



Barrel Pump 



The barrel pump (fig. 164) has a hand- 

 operated pump attached to a barrel or 

 similar container for the spray. The 

 whole assembly is mounted on a sled or 

 wheels or loaded in a wagon or truck. 

 In certain types, called wheelbarrow 

 sprayers (fig. 165), the container is 

 small enough so that it can be mounted 

 between handles with a single wheel in 

 front and be pushed by the operator. 

 The operation of the barrel pump is 

 laborious, and it is difficult to maintain 

 constant high pressure. Because of 

 these factors a power outfit is preferred. 



Figure 164. — Barrel pump mounted on 

 wheels and equipped with hose, ex- 

 tension rod, shut-off, and nozzle. 



Figure 165. — "Wheelbarrow type of 

 sprayer. 



Power Sprayers 



Power sprayers are more satisfactory 

 than other types for the commercial 

 nurseryman, florist, or owner of a large 

 estate where extensive spraying opera- 

 tions are often necessary. Numerous 

 types are available, and the individual 

 grower can usually obtain one suited to 

 his particular needs. Power sprayers 



are driven by motors, either gasoline or 

 electric, and range in size from the small 

 outfits of 10- to 50-gallon tank capacity, 

 with single-cylinder pumps which main- 

 tain a pressure of 150 to 200 pounds, 

 to large rigs for use in orchards and 

 parks. 



The small outfits are usually pulled or 

 pushed by a workman, and are useful 

 in small commercial plantings of orna- 

 mentals, vegetables, and small fruits, 

 and in greenhouses. The larger types 

 are either horse- or tractor-drawn, or 

 they are self-propelled. 



DUSTERS 



When a regular duster is not readily 

 available, dust mixtures may be ap- 

 plied to upper surfaces of plants fairly 

 well by the shaker method — that is, 

 the dust or powder is placed in a con- 

 tainer such as a quart tin can having 

 holes punched in the bottom from the 

 inside with the point of a 6-penny nail. 

 Simply shake the can over the plants 

 (fig. 166). A piece of cheesecloth or 



Figure 166. — Shaker-can method of 

 applying insecticidal dusts. 



burlap folded baglike (fig. 167) can be 

 used in a similar manner. These crude 

 devices are of little or no value in ap- 

 plying the dust to the under sides of the 

 leaves, as is necessary in the control of 

 insects which feed from the under sur- 



