A methyl bromide soil injector

Material Information

A methyl bromide soil injector
Easter, Stephen S
Dunn, William J
United States -- Bureau of Entomology and Plant Quarantine
Place of Publication:
Washington, D.C
U.S. Department of Agriculture, Bureau of Entomology and Plant Quarantine
Publication Date:
Physical Description:
3, [2] p. : ill. ; 27 cm.


Subjects / Keywords:
Soil fumigation -- Equipment and supplies ( lcsh )
White-fringed beetles -- Control ( lcsh )
Bromomethane ( lcsh )
federal government publication ( marcgt )
non-fiction ( marcgt )


General Note:
Caption title.
General Note:
General Note:
"November 1942."
Statement of Responsibility:
by Stephen S. Easter and William J. Dunn.

Record Information

Source Institution:
University of Florida
Rights Management:
This item is a work of the U.S. federal government and not subject to copyright pursuant to 17 U.S.C. §105.
Resource Identifier:
030351796 ( ALEPH )
781860475 ( OCLC )

Full Text


November 1942 ET-203

Agricultural Research Admini -tration
Bureau of Entomology and Plant Quarantine


Byr Stephen S. Easter L/ and 7iliia J. Dunn,
Division of DomestiQ Plant Quarantines

Among methods used in the control of the &hite-fringed beetle,
it has been found in certain n'ases that it iz desirable to fumigate
soil in situ. Such fumigation of soil with either methyl bromide or
carbon disulfide has been approved by the Bureau of Entomology and
Plant Quarantine._/

The use of carbon disulfide necessitate, :onsiderable cc=mon
labor and the method employed can be usod only withini n certain tem-
perature limits which tend to restrict its general use. The physi-
cal nature of the highly volatile methyl bromide (B.P. 4.60 C.,
40.35 F.) requires that it be handled in closed equipment and be
released directly into the soil to insure It., effectiveness and
reduce the loss of material to a minium. !ethyl bromide soil
injectors satisfying these requirements were used by Berry 3/ in
rodent control. A commercial valve designed to discharge a small
quantity of liquid methyl bromide at each operation of the valve
was adapted by the Division of Control Investigations in an experi-
mental soil injector. Certain improvements have been made in t 'is
injector incorporating valuable sugge.:tioi irom several sources.4/

_/ Now with the Division of Control Investigations.

2/ United States Department of Agri(.ulture. White-fringed
beetle administrative instructions modified .--- treatments author-
ized. B.E.P.Q.-503. Fourth revision, effective January 9, 1942.

3/ Berry, C. E. Methyl bromide as a rodenticide. Calif. Dept.
Agr. Bul. 27: 172-180, illus. 1938.

4/ Acknowledgment is made in particular of suggestions from
E. M. Livingstone and G. R. Swank, both of the Division of Control


Figure i is a drawing of the completed injector. The liquid
nethi bromide is conducted to the valve from a supply cylinder
through rubber air hose (A), capable of withstanding over 125
pounds pressure per square inch, attached to the inlet (F) of the
injector by ordinary air-hose couplings. Supply cylinders are
available in 10-, 50-, and 150-pound sizes. For small jobs it is
posibe to place a 1-pound dispenser just above the double valve,
conne'ting it to inlet (17). in he supply cylinders the methyl
bro iJe is maintained under a pressure of 5 pounds per square inch
or e b., the addition of air. This extra pressure is necessary
to maintain a rapid flow of the fu-igant to the double valve
chamber, permitting a more rapid operation of the injector. How-
evcr, the injector may be operated, although at a slower speed,
by the pressure of the methyl bromide itself.

The handle (B) is made of 1-inch pipe ..ith the control levers
(C and D) Nithin easy reach of the operato-r fingers. These con-
to lv. are attached around the g iron (J) by welding them
to a 1lat 1/8-inch iron strap bent to fit around the angle as shown
in fgure e, The control levers are attached y rods to a flat bar
(L) h'&h is in turn solidly fixed to the ,alve stem (M). The con-
trol levers and bar are shown in a neutrQl posX ion with both inlet
and outlet closed, The control levers a opposed -ith internal
springs in the plunger chambers which as1i. in returning both to
the eutral position. This requires that the control levers work
smoothly on the angle irons, and they are kept ell lubricated with
a hea y .up grease. If difficulty i.. fou.d in having the contro!
lever reta in to the neutral position, additio-.i coil springs may
be uttached from the base (K) to the bar (L) ,-here holes (N and 0) o The double valve conJits of 2 Aiding steel plungers
operating in brass seats with 2 internA springs mentioned above
capabLe of closing each plunger auto atically hen the control
levers are released. Both plungers operate in the same chamber.
When the inlet plunger is opened by pulling controll lever (C) the
chamber is filled ith methyl bromide b! ,he pressure in the supply
cylinder. The operator can see hen the chamber is filled, as the
pressure gauge (I) will indicate a tc dy pressure equal to that
in th cwpply cylinder. Since both plunger are operated by the
sa(e Mtel (l), it is not possible for both to be open at the sameo
time. When the chamber is filled, the control lever (C) is re-
leased, closing the inlet. Control lever (D) is then pulled to
open tie outlet plunger and held until the expansion of the methyl
bromide forces the fumigant out through the needle (H). This will
be sho.,.n to be complete when the pressure gauge indicates zero
pressure within the chamber. The pressure gauge should be faced


so that the operator can see it while operating the injector.
A short pipe (G) connects the outlet (E) ith the base (K) The
frame is made of angle iron (J) welded to handle (B) and the base
(K), a piece of bar steel 1 by 2 by 4 inches drilled to receive
pipe (G) and needle (H). The needle or point (H) is imade of one-
half inch shafting with a one-eighth inch boring and 2 staggered
crossholes one-sixteenth inch. in diameter near the tip as shown
in figure 1. These crossholes are bored at right angles to each
other and must be countersunk to prevent plugging with soil

In the operation of the injector the ground should be arkd
in some manner to indicate the locations here the methyl broi4de
should be applied. Control (C) is lifted and held as the injector
is thrust into the ground so that the chamber will be filled as soon
as or before the needle is completely inserted to the desired depth.
When the needle is completely inserted, lever (C) is released and
lever (D) lifted to release the increme t of rethyl bromide into the
soil. Each operation of the control lever should be checked with
the pressure gauge until the operator is familiar with the time re-
quired for each injection. Usually it requires from i to 2 seconds
to fill the chamber or expel the fumigant. The increments used were
7.5 cubic centimeters. This could easily be increased by adding to
the size of the chamber with a short piece of pipe betv,-een the
gauge and the chamber. It has been found difficult to make use of
increments of less than 5 cubic centimeter5 with a chamber of the
present size. The injector has been operated with about 30 feet of
hose from the cylinder to the injector, which gives a working area
of reasonable size. The liquid fi-ethyl bromide does not attack the
brass valve but will rust the iron par-ts and affects the rubber
hose. Synthetic rubber is more resistant to the action of the
methyl bromide but is not available. Standard air hose has been
used over a period of a year.




The complete soil injector, front and side views.



Handle and sliding part shown partly en-
closing the angle iron of the frame.


iII I6Il0l 24 11ll llIl
3 1262 09240 8953

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