3941] 
SERVICE AXD REGULATORY ANNOUNCEMENTS 
77 
(d) The aqueous solution of methyl bromide and alcohol shall then be ap- 
plied evenly over the surface of the sand around the plants at the rate of 40 
gallons per 100 square feet of surface area by means of a sprinkling can or 
sprayer. 
(ii) Type of material, exposure, and temperature. — (a) In Orleans Parish, 
including the city of New Orleans, Saint Bernard Parish, and regulated parts 
of Jefferson and Plaquemines Parishes, La., the treatment shall be applied only 
to plants in soil balls not greater than 7 inches in diameter, nor greater than 7 
inches in thickness when not spherical. After the required dosage has been 
applied, the soil balls shall remain embedded in the sand for a period of 8 hours. 
The temperature of the soil balls during the treatment shall not be lower 
than 65° F. 
(b) In all regulated areas other than Orleans Parish, including the city of 
New Orleans. Saint Bernard Parish, and regulated parts of Jefferson and Plaque- 
mines Parishes, La., the treatment shall be applied to soil balls not greater 
than 8 inches in diameter nor greater than 8 inches in thickness when not 
spherical. After the required dosage has been applied, the soil balls shall 
remain embedded in the sand for a period of 6 hours. The temperature of the 
soil balls during the treatment shall not be lower than 62° F. 
(c) Potting soil. — (1) Carbon disulphide fumigation, (i) Potting soil shall 
be treated in a container with carbon disulphide at a dosage of 2 pounds per 
cubic yard of soil for a period of 48 hours. 
(ii) The grade of carbon disulphide shall be comparable to U. S. P. grade 
having a specific gravity of 1.25 at 68° F. 
(iii) The container shall be tight, preferably lined with sheet metal, and 
shall have a tight cover or be covered with a tarpaulin immediately after the 
fumigant is applied. The container shall not be more than 36 inches deep. 
(iv) The soil shall be friable, and wet soil shall not be treated by this 
method. The fumigant shall be applied to the soil in holes 3 inches deep, the 
dosage to be evenly divided among holes 1 foot apart over the surface of the 
soil, and the fumigant shall be covered with soil as soon as it is applied. 
(v) The temperature of the soil shall not be lower than 40° F. during the 
entire time of treatment. 
(vi) The condition of the soil and the apparatus used and the method of 
application of the fumigant must meet with the approval of an authorized 
inspector of the United States Department of Agriculture. 
(2) Methyl bromide fumigation. — (i) Potting soil must be treated in a 
container with methyl bromide in a dosage of 40 cubic centimeters of methyl 
bromide per cubic yard of soil for a period of 48 hours. 
(ii) The sides, bottom, and seams of the container shall be tight, preferably 
lined with sheet metal, and shall have a tight cover or be covered with a 
tarpaulin immediately after the fumigant is applied. 
(iii) The condition of the soil and the apparatus used and the method of 
application of the fumigant must meet the approval of an authorized inspector 
of the United States Department of Agriculture. 
(3) Heat treatment, (i) Live steam, under pressure of 80 pounds or more 
per square inch, shall be applied through a grid of perforated pipes at the 
bottom of the sterilizing box or truck body containing the soil, for a period of 
45 minutes or until all parts of the load reach a temperature of 200° F. 
(ii) The grids shall be constructed of 1-inch pipes, perforated with holes 
1/32 inch in diameter on the upper side and connecting at one end to a 
manifold into which the steam is introduced. 
(iii) . The layer of soil in the sterilizing box shall not be more than 2 feet, 6 
inches deep. 
(c) Disclaimer. — There has been opportunity to test these treatments on only 
relatively few varieties of plants and in authorizing the movement of potted 
plants, nursery stock, or potting soil fumigated according to the requirements 
stated above, it is understood that no liability shall attach either to the United 
States Department of Agriculture or to any of its employees in the event of 
injury to either plants or operators. 
(d) Caution. — (1) Methyl bromide — Methyl bromide is a gas at ordinary 
temperatures. It is colorless and practically odorless in concentrations used for 
fumigation of plants or potting soil. It is a poison and the operators should 
use approved gas masks when exposed to the gas in concentrations used in 
fumigation, or while preparing the solution. The plants in the fumigation 
chamber should he well aerated by blowing air through them, and the room 
