FUMIGATION OF CITRUS TREES. 
79 
per tree. After completing the treatment of an orchard, knowledge 
of the number of trees covered and the amount of cyanid used fur- 
nishes immediate means of calculating the cost. 
The estimates of association, county, and private work will vary 
somewhat from the above figures, for in these cases the work is sup- 
posed to be performed at actual cost. The following figures enter 
here and are the average of field conditions. Cyanid is purchased at 
practically 25 cents per pound in large quantities (tons) and 25J cents 
in smaller lots. Sulphuric acid costs about 1^ cents per pound. 
Five men are required to run an outfit. The foreman receives about 
50 cents per hour, while the other 4 men receive about 35 cents each 
per hour. This makes a total cost of about $1.90 per hour for labor. 
By adding to the cost of labor the cost of cyanid arid acid, as well as 
allowing a certain amount for transporting the chemicals to the field, 
and including the cost of, as well as wear and tear on the tents and 
other equipment necessary in fumigation work, we have a basis for 
estimating the real cost of the operation. 
Most trees fumigated require between 5 and 18 ounces of cyanid. 
An average dosage would be about 10 ounces. A supply cart (pp. 
22-23) can be equipped complete for about $35. 
Generating pots cost as follows: One and one-half gallon, 35 cents; 
2-gallon, 45 cents; 3-gallon, 65 cents. 
Below are given the prices of different sized octagonal sheet tents 
ready for use, as furnished by one of the largest dealers in fumigating 
tents in southern California. These prices are based on the assump- 
tion that an entire outfit of 30 tents is to be purchased. If only a 
single tent is purchased, the cost will be slightly greater than these 
figures. Fluctuations in the cotton market will cause a variation in 
the price of tents. 
Size. 
230 (7- 
ounce) 
special 
drill.i 
200 (8- , 
ounce) 
special 
drill.i 
8-ounce 
special 
Army 
duck. 
17-foot 
$6.46 
12.92 
19.95 
28.50 
36.10 
43.70 
45.60 
50.35 
62.70 
69.35 
91.20 
114.76 
$6.97 
13.94 
21.53 
30. 75 
38.75 
47.15 
49.20 
54.32 
67.65 
74.82 
98.40 
123. 82 
$6.12 
24-foot 
12.24 
30-foot. . . 
18.90 
36-foot 
27. 00 
41-foot 
34.20 
43-foot 
41.40 
45-foot 
43.20 
48-foot 
47.70 
52-foot 
59.40 
55-foot 
65.70 
64-foot 
86.40 
72-foot 
108. 72 
i The 7 and 8 ounce special drills are those recommended by this investigation (p. 12). The inferior grades 
of drill ordinarily employed are about 20 per cent cheaper than the 7-ounce special. 
The cost of thirty 45-foot tents of special 7-ounce drill together with 
the other equipment necessary to complete the outfit will approxi- 
mate $1,400. 
