106 MISC. PUBLICATION 62 6, U. S. DEPT. OF AGRICULTURE 



15 to 20 pounds of dust mixture or 75 

 to 100 gallons of spray per acre may be 

 sufficient, whereas in thick beds of large 

 plants more than twice this quantity 

 may be necessary to reach all the insects 

 with a contact insecticide. 



SPRAYING AND DUSTING 

 EQUIPMENT 



Many types of spraying and dusting 

 apparatus and accessories are obtain- 

 able for use in the flower garden, and 

 there is sufficient range in price to place 

 some form at the command of every 

 gardener. Certain commonly used types 

 are discussed below. 



SPRAYERS 



The spraying apparatus should be so 

 constructed that it will break up the 

 liquid into a fine mistlike spray and 

 insure an even coating of the material 

 over the plant surface. When buying 

 equipment, especially of the larger types 

 for use by the commercial growers, see 

 that it is made to permit easy replace- 

 ment of parts, such as the valves, which 

 are likely to wear out quickly. The 

 container for the liquid should be of 

 wood, glass, copper, or galvanized steel, 

 as bordeaux mixture and some other 

 materials corrode tin and iron. The 



use of an angle nozzle aids in applying 

 materials to the under sides of the 

 leaves and other inaccessible parts of 

 plants and shrubs. 



Types of equipment suited for use in 

 gardens or estates and by commercial 

 floral nurserymen are as follows: 



Hand Atomizers 



Where only a few plants are to be 

 treated, a hand atomizer (figs. 160, A, 

 and 161, A) is very convenient to use, 

 although the under sides of the plant 

 are difficult to reach with it. These are 

 the familiar sprayers used for applying 

 fly sprays in the home. Usually they 

 hold from a half pint to a quart or more 

 of material. 



Compressed-Air Sprayers 



The compressed-air tvpe of spraver 

 (figs. 160, C, and 161, B) is the most 

 satisfactory for the home gardener. By 

 the use of an extension rod, shrubs and 

 low-growing trees can be sprayed with 

 it. Compressed-air sprayers are usually 

 made of galvanized sheet steel or brass 

 and have a capacity of 1 to 5 gallons. 

 The sprayer consists of an airtight tank 

 into which is clamped a pump. In 

 operation the tank is filled with spray 

 to about two-thirds of its capacity, and 

 the opening is closed by a tight-fitting 

 cap. Air is then pumped in by hand 



Figure 160. — Spraying and dusting equipment: A, Hand atomizer; B, 

 hand duster (both useful for small gardens); C, compressed-air sprayer; 

 D, rotary fan or blower type of duster (the last two useful for larger gardens). 



