7O FUMIGATION METHODS 
forward, allowing the gas to escape before the appara- 
tus 1s transferred from one tree to another. 
With an equipment of fifteen fumigators of this 
type three hundred to four hundred trees can be cov- 
ered in a day at a cost, including labor and chemicals, 
FIG. 40—PLACING THE CHEMICALS UNDER FUMIGATOR 
of about six cents per tree. For an outfit of this char- 
acter in mountain orchards, where the ground is rough, 
ten men are necessary to manipulate it to best advan- 
tage. Three men handle the boxes, as shown in Fig. 
39. It also requires three individuals to shovel the 
earth around the base of the fumigator, as seen in Fig. 
