1932] 
SERVICE AND REGULATORY ANNOUNCEMENTS 
31 
or determined by analysis as being of the proper concentration. (2) That all 
six conditions (p. 33) governing the application of the treatment have been met. 
Material. — Use 50 per cent miscible carbon disulphide. 
Caution. — Miscible carbon disulphide and carbon disulphide emulsion are 
inflammable, and the same care should be exercised in handling them as in 
handling carbon disulphide. 
Equipment. — Strips of 24-gage galvanized iron 10 inches wide and of the 
proper length are required. (Table 1.) 
Table 1. — Size of collar 
Diameter of ball to be dug 
Diameter 
of cellar 
Length of 
collar 
Diameter of ball to be dug 
Diameter! 
of cellar 
Length of 
collar 
Inches 
Inches 
18 
21 
27 
30 
33 
Feet 
8 
9 
Inches 
24 
Inches 
36 
39 
42 
45 
48 
Feet 
10H 
14 
25-27 
11^ 
18 
28-30 
12 
20 
33 
13 
22.. . 
36 
14 
Condition of plants. — Dilute carbon disulphide is least injurious to roots when 
the plants are dormant or semidormant, and treatment should be applied at that 
time. 
Dosage. — The dilution depends upon the probable temperature of the soil 
during the 48 hours following application, and may be determined from Table 2. 
Tabb 2. — Dosage for different soil temperatures 
Minimum soil temperature 6 inches below the surface 
Miscible 
carbon di- 
sulphide per 
10 gallons 
of water 
40° -50° F..' _ _ 
Cubic 
centimeters 
68 
50° -60° F 
57 
60°-70° F 
45 
The concentration of the emulsion must not be greater than is necessary, as 
this may injure the plants. 
The dosages which must be applied under different conditions are given in 
Table 3 or Table 4. 
Table 3. — Dosage for circular collars 
Diameter of collar 
Water 
Miscible carbon disulphide for tem- 
perature of— 
40°-50° F. 
50°-60° F. 
60°-70° F. 
Inches 
12 
Gallons 
2.0 
3.0 
4.5 
6.0 
8.0 
10.0 
12.0 
15.0 
17.5 
21.0 
24.0 
27.5 
31.5 
Cubic cen- 
timeters 
14 
20 
31 
41 
55 
68 
82 
102 
119 
143 
164 
187 
215 
Cubic cen- 
timeters 
11 
17 
26 
34 
45 
57 
68 
85 
99 
119 
136 
156 
179 
Cubic cen- 
timeters 
g 
15 
14 
18 
20 
21 
27 
24. 
36 
27 
45 
30 
54 
33 
68 
36 
80 
39 
95 
42.... . 
108 
125 
143 
45.. 
48 
