30 BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE [Jan.-March 
HEAT TREATMENT METHOD 
(1) 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. 
(2) The grids shall be constructed of 1-inch pipes, perforated with holes 
one-thirty-second of an inch in diameter on the upper side and connecting at 
one end to a manifold into which the steam is introduced. 
(3) The layer of soil in the sterilizing box shall not be more than 2 feet, 
6 inches deep. 
DISCLAIMER 
In authorizing the movement of potting soil treated according to the require- 
ments 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 resulting from the use of these treatments. 
CAUTION 
Methyl bromide is a gas at ordinary temperatures. It is colorless and prac- 
tically odorless in concentrations used for fumigation of plants. It is a poison, 
and the operator should use an approved gas mask when exposed to the gas 
at concentrations used in fumigation. 
After fumigation of potting soil by the above method, the cover should be 
removed and the soil allowed to aerate. (Sec. 301.72-5a, issued under authority 
contained in sec. 301.72-5.) 
Lee A. Strong, 
Chief, Bureau of Entomology and Plant Quarantine. 
TERMINAL INSPECTION OF PLANTS AND PLANT PRODUCTS 
Post Office Department, 
Third Assistant Postmaster General, 
Washington, January 9, 1939. 
AMENDMENT OF OREGON PLANT QUARANTINE ORDER NO. 18 
Oregon Plant Quarantine Order No. 18 (A Series) pertaining to the Oriental 
fruit moth was amended November 23, 1938, so as to permit the acceptance 
for transportation into that State during the dormant period from November 
1 to March 15 of bare-rooted trees of the peach, nectarine, almond, apricot, plum, 
cherry, choke-cherry, quince, pear, or apple and the flowering forms thereof, 
provided they are accompanied with a certificate by a State plant inspector of the 
State of origin, showing the plants to have been adequately fumigated, accord- 
ing to specifications of the Oregon State Department of Agriculture. 
Under the Oregon State quarantine as previously enforced, and as published 
in the Postal Bulletin of July 27, 1937, and on page 44 of the August 1937 
Supplement to the Postal Guide all varieties and species including the flowering 
forms of the peach, nectarine, almond, apricot, plum, cherry, choke-cherry, quince, 
pear, and apple trees and plants and parts thereof were prohibited entry into 
Oregon from the States named in the published notice. The modification allows 
their entry when the roots are bare during the period from November 1 to 
March 15 after fumigation as required and when accompanied with a proper 
certificate showing fumigation treatment. 
Postmasters will please, therefore, make the proper correction and be governed 
accordingly. 
Ramsey S. Black, 
Third Assistant Postmaster General. 
