- 3 - 
(i) such corn and corn parts have been manufactured or pro- 
cessed in such a manner as to eliminate all risk of 
carriage of the European corn "borer, Pyraust a nubi lalis 
Hbn. , or 
(ii) each shipment is accompanied "by a certificate issued 
and signed by an officer of a State or the Federal 
Department of Agriculture, establishing that each such 
shipment has been fumigated in a vacuum or air-tight 
vault as prescribed in the following fumigation 
schedules, or 
(iii) each shipment of shelled corn is accompanied by a cer- 
tificate issued and signed by an officer of a State or 
the Federal Department of Agriculture stating that the 
corn has been examined and found free from the European 
corn borer, Pyrausta nubilalis Hbn., and corn cob and 
corn stalk debris, or 
(iv) each shipment of shelled corn is accompanied by a cer- 
tificate issued and signed by an officer of a State or 
the Federal Department of Agriculture stating that the 
shelled corn had been passed through a screen of half- 
inch mesh or less, and is believed to be free from corn 
parts capable of harbouring a larva of the European 
corn borer, or 
(v) each shipment of such corn or corn parts is accompanied 
by a certificate issued and signed by an officer of a 
State or the Federal Department of Agriculture, establish- 
ing that the corn or corn parts contained in the shipment 
originated in a State in which the European corn borer, 
Pyrausta nubilali s Hbn, , is not known to occur* 
