266 BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE [Oct.-Dec 
partmeiit of Agriculture will be conditioned on the State of Texas providing foi 
and enforcing the following control measures in manner and by method approved 
by the T'nited States Department of Agriculture, namely: 
SIXTION A. HOST-FREE PERIOD 
A host-free period shall be maintained each year beginning on the first day ot 
May and continuing until the first day of September, subject to such modification 
as to duration and dates of commencement and termination as may be author- 
ized by the Chief of the Bureau of Entomology and Plant Quarantine when in 
his judgment such modification does not involve increased risk of spread of the 
Mexican fruitfly. 
Prior to the commencement of 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 flyproof storage approved by the Chief of the Bureau of Ento- 
mology 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 imma- 
ture citrus fruits which in the judgment of the Chief of the Bureau of Entomol- 
ogy and Plant Quarantine are not susceptible to infestation by the Mexican 
fruitfly. 
SECTION B. INSPECTION 
A system of inspection shall be carried on throughout the year to provide for 
the efficient enforcement of sections A and C of this regulation, for the prompt 
discover^' of any infestations which occur, and for the enforcement of such con- 
ditions in and around citrus groves and packing and processing plants as shall 
be necessary to prevent the dissemination of Mexican fruitfly through the inter- 
state movement of citrus host fruits. 
SECTION C. INFESTED ZONES 
Upon the determination of a Mexican fruitfly infestation within a reguhited 
area, w^hich 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 Uniteii States 
Department of Agriculture and all host fruits in susceptible stages of maturity 
produced within such zone and existing in the regulated area shall be destroyed 
or processed in such a manner as to render them free from infestation. 
Regui^vtion 8. Marking Requirements 
Every crate, box, or other container of host fruit moved interstate under 
these regulations shall have securely attached thereto a shipping permit (Form 
443) issued under the provisions of regulation G, 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 (Form 515) 
showing the number of containers and either the license number and destination 
of the vehicle or the name, number, and destinati<m of the freight car or other 
carrier, as the case may be. 
Regulation 9. 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 op place. 
Regulation 10. Shipments by the United States Department of Agriculture 
Articles subject to restriction in these regulations may be moved interstate 
by the United States Department of Agriculture for experimental or scientific 
