Insect and Fungous Enemies of the Grape. Th 
the mixture as the pump is operated. For convenience in use these 
pumps may be clamped to the bucket or used free in a tub or other 
vessel containing the spray material. They should be supplied with 
a spray rod and sufficient hose to reach conveniently all parts of the 
plants to be sprayed. 
SMALL COMPRESSED-AIR PUMPS. 
Compressed-air pumps (fig. 74) are frequently used in small fruit 
gardens and are preferred to the bucket pump by those who do not 
wish to pump while applying the spray. These pumps are usually 
made of brass or galvanized sheet steel and have a capacity of 3 to 4 
Fig. 74.—-Compressed-air sprayer. 
gallons. They are carried by means of a shoulder strap. In the 
better types agitation is provided by the entrance of the air at the 
bottom of the tank. After the spray material is poured into the tank 
and the opening closed by an air-tight cap, the air is pumped until 
the liquid is under sufficient pressure. The tank is usually emptied 
by three or four pumpings of a dozen strokes each. 
BARREL PUMPS. 
The barrel hand-pump outfit (fig. 75) has a capacity of about 50 
gallons and is widely used for the fruit or the home orchard, small 
vineyard, and fruit garden. The pump should be provided with an 
efficient agitator, either of the paddle or rotary type. To insure 
