90 FUMIGATION METHODS 



the gas method withouj: difficulty if the rules given 

 herewith are carefully followed. 



Ivarge outfits are so expensive it is desirable in 

 many cases for the state, county, or local society to 

 own the tents and other equipment. In California 

 especially, where it is necessary to operate at night, 

 these outfits are practically controlled by county and 

 local organizations. The number of persons necessary 

 to operate a system of fumigators depends somewhat 

 on the size of the trees and the number and kind of 

 tents. One or two men introduce the chemicals, 

 others look after the vessels, measure the acid and 

 water, while others manipulate the tents. As soon as 

 the tent is in place, the fumigator enters it, introduces 

 the chemicals, withdraws quickly, closes the tent, and 

 proceeds to the next tree. In many cases the assistant 

 raises the edge of the tent, while the fumigator enters 

 and drops it as soon as he comes out. The wagon 

 containing the chemicals is then drawn to the next 

 tree. The generator beneath the tree just fumigated 

 is removed, and the contents poured on the ground near 

 the trunk of the tree. The acid and water are meas- 

 ured, carried to the next tent, and introduced, as shown 

 in Fig. 45. Various appliances are used for carrying 

 and handling the chemicals in an orchard in the east. 

 A wheelbarrow or small hand-cart has been found very 

 useful, as shown in Fig. 22. In other cases a small, 

 table-like tray is used to carry the apparatus, as seen 

 in Fig. 38. 



The location of an orchard and its freedom from 

 dampness and fog must be considered. The ground, 

 trees, and the leaves should be dry when fumigated. 



