1932] SERVICE AND REGULATORY ANNOUNCEMENTS 9 
P. Q. C. A.— 328. 
FREEZING TREATMENT OF GREEN CORN ON THE COB AS A CONDITION OF 
CERTIFICATION UNDER THE EUROPEAN CORN-BORER QUARANTINE REGULA- 
TIONS 
[Authorized under regulation 6, paragraph (&), Quarantine 43] 
(Issued February 3, 1932; effective February 5, 1932) 
The revision of the regulations supplemental to Notice of Quarantine No. 43, 
effective February 5, 1932, provides under regulation 6, paragraph (&), that 
articles may be certified for movement from the regulated area " when the 
articles have been disinfected or treated under the supervision of an inspector 
in such a manner as to eliminate all risk of transmitting infestation." 
The evidence is apparently conclusive that all stages of the European corn 
borer which may be present in sweet corn in the milk or dough stage of maturity 
can be killed by freezing the corn and holding it at certain low temperatures. 
The following method of sterilization is therefore authorized as one of the con- 
ditions under which certificates may be granted for the interstate movement of 
green corn on the cob in that stage : 
Subject the corn to freezing temperatures and, after it is frozen, cool it until 
it is at or below a temperature of 0° F. ; hold it at or below that temperature for 
a period of eight days from the time all the corn in each part of the package 
reaches that temperature. If at any time during the holding period any of the 
corn is found to be above a temperature of 0°, the corn in that container or lot 
will not be certified as having been sterilized until such specified low tempera- 
ture has been reached and maintained for a period of at least eight consecutive 
days. 
No method of freezing or cooling the corn to the required temperature is pre- 
scribed, nor is the department or its employees responsible in any way for any 
injury to the corn which may occur in applying this process. It is suggested 
that the corn be treated in small containers of not over a bushel capacity which 
can be handled easily and which will be accessible to the inspectors in deter- 
mining the temperature of the product. 
This treatment is not applicable to seed corn that is mature or has passed 
through the dough stage, as from the evidence at hand it is not certain that all 
stages of European corn-borer larvae in such mature corn would be killed by 
this treatment. If, in the judgment of the inspector, corn has reached such 
state of maturity, certificates authorizing the interstate movement of such 
corn on the basis of a freezing treatment will not be issued. 
Lee A. Strong, 
Chief of Administration. 
NOTICE OF PUBLIC CONFERENCE TO CONSIDER THE ADVISABILITY OF REMOVING 
THE FEDERAL DOMESTIC QUARANTINE ON ACCOUNT OF THE EUROPEAN CORN 
BORER 
February 18, 1932. 
Notice is hereby given that a public conference will be held by the Plant 
Quarantine and Control Administration in the auditorium of the Natural His- 
tory Building, United States National Museum, Tenth Street and Constitution 
Avenue NW., Washington, D. C, at 10 a. m., March 24, 1932, at which con- 
sideration will be given to the advisability of revoking Notice of Quarantine 
No. 43, as revised, and the regulations supplemental thereto. 
The purpose of this quarantine has been to retard the spread of the European 
corn borer and prevent the establishment of new centers of infestation. Mean- 
while investigation of methods of control, the dissemination of information as 
to such methods, the introduction of parasites, and the development of resistant 
varieties have been under way. It is desired at this conference to consider (1) 
whether these investigations and other activities have reached such a stage 
that the Federal quarantine restricting the interstate movement of corn and 
other products should now be removed; (2) whether the continued spread of 
the European corn borer by flight and other means has been so extensive and 
persistent as to render undesirable and inexpedient further effort by the 
Federal Government in attempting to retard distribution of the pest in inter- 
state commerce; and (3) whether the States which have not yet been reached 
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