UNIT D STATES DEPARTMENT OF AGRICULTURE
Bureau of Entomology and Plant Quarantine U8BA
Washington, D. C. T pj.F T
B.E.P.Q.--~486 January 29, 1933.
Sec. 301.72-5b Administrative Instruictions
Modifying the restrictions of the white-
fringed beetle quarantine by authorizing
treatment of plants in pots or in soil-
balls not exceeding three (3) inches in
Recent experimental work by the Bureau of Entomology and Plant
Quarantine of the U. S. Department of Agriculture has proven that cer-
tain potted plants, hereinafter listed, nan safely and successfully be
fumigated for the control of white-fringed beetle.
T=ZATMENT AUTMORIZ ED
Under provisions contained in Regulation 5(a)(Sec. 30'.72-5)
supplementa] to Notice of rai-antine No. 72 (Sec. 301.72), the Chief
of the Bureau of Entomolor.gyj and Plant Quarantine authorizes as a
prerequisite to certification, the following method of treatment, for
certain kinds and size- of potted and bal -d and burlauped plants,
when done under the su:-rvisi'n of an aut-cri'ed inspector of the
U. S. Department of Agc-riculture.
FMAIGAT~r1 tCL R~kAM-T _____O
(1) Fumirnation must be done with methyl bromide at a dosage
of one pound per 1,000 cubic feet, inc udilng the spane occupy d by
the plants, for a period of 4 hoxrs, thf soil in whiv thr iots ar-
planted and the air in the fumigation cha-ler to be at a temerature
of not less than 850 F.
(2) Such furti,!tion shall apply only to those plants in 3-inch
pots or smaller, or in soil-balls not larr tha. tlose w i woul.
be contained in 3-inch pots, and the plants sh:_11 e stced on racks
so tiat the 7as .,,ixture can '.'ave access to all sides of ti pots or
(3) The fumigation shldl be done in a tij-ht chamber with 7%s-
(4) After the chamber is loaded and closed. tV, appropriate
amount of methyl broide ;hall be volatiized therein *nd the ir-as
mixture shall be circulated by neans of a fan or blower thronghvut the
entire h-hour fuxnitation period.
(1) A fnri,-.atinn canmber, lined with sheet metal throughout
ad with a mnetal-covered door closing ae.iinst Pasklts and held tiA'htly
in place b-, refrircrator door fasteners, is recoenk-
(2)' A list of plants, which have been furmicated experi-entally
itl -thyl bromide according to the recommendations here rive. and are
classified as to their ability to withstand such tre,-tient as indicated
by these experiments, is Att;ched.
In authorizing the movement of potted plants or nursery stock
fumi.'ated according c to the requirements stated above, it is understood
t'a.at no liability siall attack, either to the U. S. Departrient of Lcricul-
ture or to any of its employes in the event of injury reslltinc from
the use of the fu A.:ant.
Methyl bromide is a -_as at ordinary temperatures. It is color-
less and practically -ocrless in concentrations used for furigetin of
plants. It is a poison, and the operator should 'ase an approved gas
asI: when exposed t. the ,as at concentrations used in fx-_i-ation. The
plants ill the furi-ati- charter should be well aerated by blowing air
through the- and the roo.- ade lately ventilated before it is e.Atered.
(Sec. 301.72-D) LB. P.Q._--4g, Jan.,28, 10,39.7
LEE A. STRONG
Chief, 3~raeau of Entociology and Plant Qt.arantine.
The following plants, known to the trade by the following
names, have been fumigated in up to 3-inch pots with methyl bromide at
the rate. of one pound per 1,COO cubic feet for 4 hours at 85' F. with
the results indicated:
No injury to the following:
Codineum, cor1screw croton
croton Lobt. Criig
DracaenM, r.f s&.ne
Firris elastic (variegated)
Habrus and Hehns ivy
Pandanus veitchi. Plants
which have pure white leaves
not to be fuaidrted.
Injury not severe confined to shedding some of lower, older leaves,
to the fo.l.nwing:
Dreceena, M. Story
Injury very severe to the following fumig-tion not ]'eorn, haded:
UNIVERSITY OF FLORIDA
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