1939] 
SERVICE AND REGULATORY ANNOUNCEMENTS 
59 
Another method is to apply the fumigant after the box or bin has been filled. 
This is done by making holes from the surface to the different levels, so that 
the carbon disulfide is applied in the same positions as by the first method. 
The liquid, in this case, must be poured into the deep holes through a tube, or 
injected to insure that it reaches the proper level. 
Period of fumigation. — The box or bin must be sealed and left undisturbed 
for 48 hours. 
(3) Naphthalene fumigation 
Equipment. — No special equipment is necessary. It is not necessary to cover 
the soil. 
Condition and type of soil. — Soil of any type may be fumigated, provided it 
is friable. Wet soil must never be fumigated. 
Temperature. — The temperature must be at least 50° F. 
Dosage. — Five pounds to 1 cubic yard. 
Application. — The fumigant must be thoroughly mixed with the soil, and the 
soil then placed in a pile. 
Period of fumigation. — The soil must be left undisturbed for 1 week. 
(4) Lead arsenate treatment 
Season. — The treatment must be applied before August 1. 
Condition and type of soil. — The soil must be friable. Wet soil must never 
be treated. The treatment is recommended only for soils that are slightly 
acid or neutral in reaction. Any type of soil may be treated provided it meets 
these requirements. 
Dosage. — Two pounds to 1 cubic yard. 
Application. — The lead arsenate must be thoroughly mixed with the soil. 
Period of treatment. — Plants freed from soil and potted in soil treated in 
the above manner, by August 1, may be certified for shipment between the 
following October 1 and June in. 
Handling of potted plants. — When plants potted in lead-arsenate-treated soil 
are plunged in beds or set in frames exposed to possible infestation, the soil of 
these beds or frames must previously have been treated with lead arsenate at 
the rate of 1.500 pounds per acre. 
Treated plants carried after June 15. — When plants potted in soil treated as 
prescribed are carried after June 15, they may be again eligible for certifica- 
tion between October 1 and June 15 of the second year if, on August 1 of the 
second year, analyses show the soil to contain lead arsenate at the rate of 
2 pounds per cubic yard. 
O') Shipments of Sand, Soil, Earth, Peat, Compost, and Manure 
Shipments of sand, soil, earth, peat, compost, and manure must be treated by 
the use of heat or carbon disulfide. The instructions given in (/) (1) and (t) 
(2) must be followed. 
Type of ear. — Tight boxcars must be used between June 15 and October 15, 
inclusive, and may be used at other times of the year. Open freight cars, of 
the steel gondola type, may be used between October 10 and .lime 14. In cars 
of this type, with dump bottoms, planks must be laid on the bottoms and covered 
with heavy paper, in a manner approved by the inspector. 
Doors. — The doorways of boxcars must be boarded up and covered with heavy 
paper np to a point beyond the height of the sand, soil, etc. Certified cars must 
have the doors closed and fastened while en route within the regulated area. 
Depth of sand, soil, etc. — In boxcars, the sand, soil. etc.. must not be loaded to 
such a depth as would restrict the overhead working space and hamper the 
work of the men applying the treatment. In the open-type cars, the material 
should not be piled above the sides of the car. 
Covering with canvas, etc. — When open-type cars are used, canvases or heavy 
paper must be used to cover the surface as the treatment is applied, These 
covers must be free from holes and a foot or more wider than the width of the 
car. Where several pieces are used, they must be large enough to allow for 
overlapping at least 1 foot. The covers must be fastened down at the sides of 
the car and weighted on the surface, particularly where they overlap. 
