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ILLINOIS NATURAL HISTORY SURVEY CIRCULAR 47 



small trees and is useful for treating a larger number of plants. A 

 hand-operated wheelbarrow-type sprayer or small power sprayer, 

 fig. 57, is recommended for any job involving medium-sized plants 

 or a large number of small plants. 



Adequate spraying of large trees requires power equipment. 

 A conventional hydraulic sprayer, fig. 58, that develops 500-600 



Fig. 57. — Small power sprayer. This is a satisfactory sprayer for shrubs 

 and small trees. 



pounds pressure and has a pump that delivers 30-40 gallons per 

 minute is suitable for spraying large trees. However, if all the 

 spraying is done from the ground, a great deal of spray will be 

 wasted in trying to reach the tops of tall trees. Waste can be 

 reduced if some of the spraying is done from a tower built on the 

 sprayer. 



A mist blower, fig. 59, is more suitable than a hydraulic 

 sprayer for use with large trees. In the mist blower, a spray con- 

 centrate is discharged into a blast of air that travels through an 

 outlet at a velocity of 100-120 miles per hour. The outlet can be 

 manipulated to direct the spray concentrate to all parts of even 

 large trees. 



