DUSTING MACHINES 



99 



Dusting Apparatus 



Various types of machines are obtainable for applying insecticides 

 in powder form. Most of these are designed to be carried by hand, and 

 rapid work can be done with them under suitable conditions. They are 

 not so well adapted to applying materials to trees, nor to situations 

 that are difficult to reach because of thick, intervening foliage — as, 

 for example, in treating 

 vineyards. But for use on 

 truck or field crops, espe- 

 cially in the application 

 of powdered arsenate of 

 lead, they have a growing 

 utility. In the more de- 

 sirable types a constant 

 stream of air is maintained 

 by a rotary fan, and the 



powder may be directed through one or more outlets as desired, 

 amount of material delivered may also be regulated. 



For dusting field crops a simple device is in use in the South, consist- 

 ing of a pole 4 to 8 feet long, to which are tacked cloth bags at 

 proper intervals, according to the distance between rows. A hole 

 bored through the pole above the bag provides a means of filling it. 

 Often the pole is set across a horse's back, the jarring being sufficient to 

 sift the poison through the cloth. 



Fig. 64. — A geared powder gun. Original. 



The 



