#FATE LIBRA RY
L.. NrA"" PLANr OR
. b fP. Q.4 Revised PLAE o Effective August 10, 1950
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S .. UNIT D STATES iEPARMENT OF AGRICULTURE
...*.. AOCRICJT-.L PAL FSEAP2CH ADMINISTRATION ,
-H, ; Bt'iPEAfUno F zE]sOMOLOGY AND PLANT. WUARANTINE
VAPOR-HEAT TREAMENT APPROVED FOR CERTIFICATION OF CERTrAIN
FRUIT AN) VEGETABLES UNDER HAWAIIAN FRUIT AND VEGETABLE
QUARANTINE NO. X3
In accordance with 7 CFR 301.153-4 (b) ed the regulations supplemental
to Hawaiian Fruit and Vegetable Quarantine No; 15, the following vapor-heat
treatment is hereby designated as an administratively approved procedure that
meets thorequirements for the certification of papayas, bell peppers, Italian
squash 'and tomatoes for interstate movement from Hawaii:
Approved. vapor-heat method of treatment.--In the approved vapor-heat
treatment-, the truit and vegetables are heated by saturated vapor at 110 F.
which i condensing on the fruit and'vegetables gives up its latent heat.
This latent heat is essential in assuring mortality of eggs and larvae of the
orientalfruittly, the Mediterranean fruitfly and the melonfly, and in raising
the temperature of the fruit and vegetables evenly and quickly so as to prevent
damage to the treated products. In applying the treatment the saturated vapor
is *Ocompanied-by-a.'fine water mist and air admixture. The fruit and vegetables
are cooled immediately after treatment and no wax or paraffin, either dry or in
* solutionn, may be used until after the treatment has been completed. Vapor-heat
S treatments are approved only if the vapor' conditions within the heat treating
room, the manner of stacking the boxes containing the fruit and vegetables in
the room, and all other conditions affecting the efficacy of the treatment are
satisfactory to the supervising inspector, to assure mortality of eggs and larvae
Sof the oriental fruitfly, the Mediterranean fruitfly, and the melonfly.
In applying this treatment, in accordance with these principles, the temper-
ature Q'f-.the fruit and vegetables shall be raised to 110 F., at the approximate
center f tfti4fruit, within a period designated. by the inspector, and shall be
held at. that level during the following 8-5/4 hours.
This treatment must be conducted in a heat-treating room approved by the
Bureau of Entomology and 'Plant Quarantine and must be conducted under the super-
vision of an inspector of that Bureau, who at all times shall have access to the
fruit and vegetables while they are undergoing treatment.
The Bureau will approve only those rooms which are properly constructed and
adequately equipped to handle and treat the fruit or vegetables, at locations
acceptable to the inspector in areas where required supervision can be furnished.
Hereafter no treating plant will be approved until it is equipped with a self-
i ). .recording temperature and humidity indicator acceptable to the inspector.
"". All handling in Hawaii subsequent to treatment of fruits and vegetables
:: intended foi shipment elsewhere in the United States must be carried out to meet
Ml^^ requirements of and under the supervision of the inspector.
; ',. All costs of treatment and prescribed post-treatment safeguards, other than
^t:Y the services of the supervising inspector, shall, as required by 1 501.15-4 (b),
4 be borne by the owner of the fruits or vegetables, or his representative.
C, ". 'f~ 4 "~ V 5f' ~ .Jt 2 ? !c.! :.',~ *
.. UINIvERSITY OF FLORIDA
3 1262 09314 6701
In the tests and experiments so far conducted fruits and vegetables have'..;"
not been injured and the results following treatment have been successful. It;..4x)ia
is, however, emphasized that inexactness and carelessness in using the approved.-:.I
method .of treatment may result in injury to the fruit and vegetables treated. < r .',
In approving this treatment the .United States Department of Agriculture does not .
accept responsibility for fruit or vegetable injury.
The above treatment is in addition to any other procedure or practice that
may be found to be desirable to condition or otherwise handle fruit or vegetables :.
that may be offered for treatment. ,
This revision eliminates the previously specified 8-hour period during which .
the temperature of the fruits and vegetables are raised to the required temper- .
nature. Instead the length of this period may be as designated by the inspector. *S
This permits more flexibility to take advantage of recent experimental work .
showing that shortening this approach period increases the mortality of fruit-
flies and gives greater security from the treatment.
An additional safeguard deemed necessary to the effectiveness of this
treatment is provided by requiring that hereafter treating plants must be
equipped with self-recording temperature and humidity indicators before they are'
approved. Several other existing requirements have been rephrased in greater
This approval shall be effective August 10, 1950.
(Sec. 8, 37 Stat. 318, as amended, 7 U. S. C. 161; 7 GFR
501.15-4 (b)) .
Done at Washington, D. C., this 3rd a August 1950. '
Chief, Bureau of Ent ology and Plan rantine