138 BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE [Oct.-Dec. 
shall be subject to such modification as to duration as may be authorized by 
the Chief of the Bureau of Entomology and Plant Quarantine when in his 
judgment such modification does not involve risk of spread of the Mexican 
fruitfly. 
Prior to such host-free period each year, all restricted citrus fruit shall be 
removed from the tree for immediate sale or shipment, or for retention in fly- 
proof storage approved by the Chief of the Bureau of Entomology and Plant 
Quarantine, and all other host fruits shall be destroyed either following removal 
from the trees or by destruction of the trees themselves. 
No host fruits shall be permitted to remain on trees or to exist elsewhere 
within a regulated area at any time during such host-free period except im- 
mature citrus fruits which in the judgment of the Chief of the Bureau of 
Entomology and Plant Quarantine are not susceptible to infestation by the 
Mexican fruitfly. 
INFESTED ZONES 
(c) Upon the determination of a Mexican fruitfly infestation within a regu- 
lated area, which in the judgment of the Chief of the Bureau of Entomology and 
Plant Quarantine constitutes a risk of spread of such fly, an infested zone shall 
be designated by the State of Texas subject to approval by the United States 
Department of Agriculture and all host fruits in susceptible stages of maturity 
produced within such zone shall be destroyed or processed in such a manner as 
to render them free from infestation. 5 
Regulation 6 
Sec. 301.64-6. Marking requirements. — Every crate, box, or other container 
of host fruit moved interstate under these regulations shall have securely at- 
tached thereto a shipping permit issued under the provisions of regulation 4 
(sec. 301.64-4), and shall be subject to such other marking as may be required 
by the inspector. 
Each shipment of six or more crates, boxes, or other containers of host fruit 
moved interstate under these regulations shall, in addition to the shipping 
permit on each such container, be accompanied by a master permit showing the 
number of containers and either the license number and destination of the 
vehicle or the name, number, and destination of the freight car or other carrier, 
as the case may be. 5 
Regulation 7 
Sec. 301.64-7. Inspection in transit. — Any car, vehicle, basket, box, crate, or 
other container, moved interstate, which contains or which the inspector has 
probable cause to believe contains articles the movement of which is prohibited or 
restricted by these regulations, shall be subject to inspection by inspectors at 
any time or place. 5 
Regulation 8 
Sec. 301.64-8. Shipments for experimental or scientific purposes. — Articles 
subject to restriction in these regulations may be moved interstate for experi- 
mental or scientific purposes, on such conditions and under such safeguards as 
may be prescribed by the Chief of the Bureau of Entomology and Plant Quaran- 
tine. The container of articles so moved shall bear, securely attached to the 
outside thereof, an identifying tag from the Bureau of Entomology and Plant 
Quarantine showing compliance with such conditions. 5 
These revised rules and regulations shall be effective on and after October 
16, 1939, and shall supersede the rules and regulations promulgated October 
14, 1937. 
Done at the city of Washington this 10th day of October 1939. 
Witness my hand and the seal of the United States Department of Agriculture. 
[seal] H. A. Wallace, 
Secretary of Agriculture. 
[Copies of foregoing revision were sent to all common carriers doing business in or 
through the quarantined area.] 
• See footnote 1. 
