AS MISC. PUB. 526, U. S. DEPT. OF AGRICULTURE 
This type of duster is well suited for dusting vegetable and orna- 
_mental plants in the home garden. 
Bellows or knapsack dusters.—This type of duster (fig. 10) is carried 
on the back like a knapsack. Essentially it consists of a metal hopper 
for the insecticide, equipped with a bellows which when operated forces 
air through a discharge chamber and pipe, carrying the insecticide with 
it. The hopper is usually provided with a dust-feeding device. The 
FicureE 10.—Bellows or knapsack duster. 
dust is discharged in puffs with each stroke of the bellows. This type 
of equipment is especially suited for use on crops planted in hills. 
Bellows-type dusters are adapted for use in a variety of situations, 
from the home garden to good sized commercial plantings. However, - 
they are probably best suited for use by commercial growers in plant- 
ings where the use of power equipment is not feasible. 
Fan or blower type of duster.—In this type of duster (fig. 11) the 
hopper. which has a capacity of 5 to 10 pounds, depending upon the 
powder used, is usually located over the air chamber. An enclosed 
fan geared to a hand crank forces an even and continuous flow of air 
Figure 11.—Fan or blower duster. 
