HANDBOOK OX INSECT ENEMIES OF FLOWERS AND SHRUBS 109 



^'Ui 



Figure 167. — Applying an insecticidal 

 dust from a cloth bag. 



face, as do certain leafhoppers, aphids, 

 and flea beetles. These methods of 

 dusting often result in uneven and ex- 

 cessive application of material, and for 

 this reason dust guns should be used 

 whenever possible. 



Plunser Type of Duster 



The plunger type of duster (figs. 160. 

 B, and 168), or dust gun, is one of the 

 most common devices for applying in- 

 secticides to small areas. Its capacity 

 ranges from 1 to 3 pounds. These dust 



Oi 



<] 



Figure 168. — Plunger type of hand 

 duster. 



guns are mostly of metal and equipped 

 with metal or glass containers. They 

 usually have a tube and a nozzle attach- 

 ment that permits the dust to be directed 

 to the under surface of the leaves. 



Bellows Types of Dusters 



Two types of bellows dusters are on 

 the market. The smaller type (fig. 169) 

 is made like a fireplace or blacksmith 

 bellows and is suitable for treating small 

 areas. It is equipped with special open- 

 ings to permit applying the dust from 

 different angles. Care must be exer- 

 cised to avoid discharging too much at 

 one time. 



749493°— 48 8 



Figure 169. 



-Simple bellows type of 

 duster. 



The other type is the knapsack duster 

 (fig. 170). which can be carried on the 

 back like a knapsack. It is satisfactory 

 for applying; dusts to both small and 

 large plantings, more especially by com- 

 mercial growers in plantings where the 

 use of power equipment is not feasible. 

 The dust is discharged in puffs with each 

 stroke of the bellows. 



-Knapsack-bellows duster. 



Fan or Blower Type of Duster 



The fan or blower type of duster (fig. 

 160. D) is satisfactory for both small 

 and large gardens. Since a continuous 

 stream of dust is delivered, dusters of 

 this type are better suited for closely 

 planted crops than for crops where 

 the plants are widely spaced. The 

 knapsack-bellows and fan types are 

 much higher in price than the small 

 plunger and fireplace bellows, but from 

 the standpoint of efficiency of applica- 

 tion and long-time service they are a 

 good investment. These dusters will 

 hold from 5 to 10 pounds of insecticide. 



Power Dusters 

 Power dusters are operated by gasoline 

 engines and, like power sprayers, range 

 in size from the small wheelbarrow type 

 pushed by the operator to large horse- 

 or tractor-drawn rigs. Some outfits are 

 mounted directly on tractors. They 

 are best suited for commercial florists 

 and nurservmen. 



