1934] 
SERVICE AND REGULATORY ANNOUNCEMENTS 
Table 4. — Dosage for square collars 
9 
Miscible carbon disul- 
phide 
Length of side of 
collar (inches) 
Water 
Sched- 
ule 
no. 1— 
40-50° 
F. 
Sched- 
ule 
no. 2— 
50-60° 
F. 
Sched- 
ule 
no. 3 — 
60-70° 
F. 
12 . - 
Gallons 
2.5 
Cc 
17 
Cc 
14 
Cc 
11 
15 
4.0 
27 
23 
18 
18 
5.5 
37 
31 
25 
21. 
7.5 
51 
68 
43 
34 
24 
10.0 
57 
45 
27 
12.5 
85 
71 
57 
30.... 
15.5 
106 
88 
70 
Length of side of 
collar (inches) 
33 
36 
39 
42 
iS 
4^ 
Water 
Gallons 
19.0 
22.5 
26.0 
30.5 
35.0 
40.0 
Miscible carbon disul- 
phide 
Sched- 
ule 
no. 1 — 
40-50° 
F. 
Cc 
129 
153 
177 
208 
238 
272 
Sched- 
ule 
no. 2— 
50-60° 
F. 
Cc 
108 
128 
148 
173 
199 
227 
Temperature of soil. — Begin treating in the spring when the minimum soil tem- 
perature at a depth of 6 inches remains above 40° F., using schedule no. 1. When 
the minimum soil temperature at this depth remains above 50° decrease the con- 
centration to meet schedule no. 2. When the minimum soil temperature remains 
above 60° decrease the concentration to meet schedule no. 3. In the autumn, as 
the minimum temperature of the soil decreases, it is necessary to increase the 
schedule in the opposite order. Treatment must be discontinued when the 
minimum soil temperature at the 6-inch depth is below 40°. 
For treatment to be successful, the temperature of the soil during the 48-hour 
period of the treatment should never fall below the minimum temperature for the 
schedule used. 
Preparation of plant for treatment. — Remove all weeds and debris from the soil 
about the plant. Tie low-hanging branches so they will not dip into the solution. 
Level the soil. After the size of the soil ball to be lifted has been determined, 
place a galvanized-iron collar about the plant and force it 3 inches into the soil. 
The size of the collar to be used is shown in table 1. Firm the soil carefully on each 
side of the metal. 
Application. — Measure the diameter of the collar, find from table 3 or table 4 
the number of gallons of water and the cubic centimeters of miscible carbon 
disulphide required; and mix well. Pour into the collar, avoiding splashing or 
unnecessary disturbance of the soil. If the solution is poured on a spade it will 
help considerably. 
Period of treatment. — The soil must not be disturbed for 48 hours, but the plant 
must be dug between 2 and 5 days after treatment. 
Handling after treatment. — The plant may be dug and handled according to the 
usual nursery practice, except that the ball must be of a diameter which corre- 
sponds to the diameter of the collar mentioned in table 1. 
Conditions under which the carbon disulphide treatment may be applied 
(1) The minimum soil temperature 6 inches below the surface in the nursery 
must be 40° F. or higher for the 48-hour period immediately following the appli- 
cation of the carbon disulphide emulsion. 
(2) The surface of the soil around the base of the plant to be treated must be 
level and the treatment must not be applied where the ground has a slope of more 
than 1 inch in 10 inches. 
(3) The collars must be carefully placed in strict accordance with the directions 
in order to assure that no seepage occurs. Especial care must be taken on plowed 
and stony land to prevent loss of the solution. 
(4) A record must be made of the time of penetration of the solution on each 
plant treated. If the solution disappears from the surface in less than 10 minutes 
or requires more than 5 hours, the treatment will not be successful. 
(5) An examination must be made during the treatment and after the solution 
has disappeared to determine the uniformity of penetration. Uniform penetration 
must be obtained. 
54156—34 2 
