16 BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE [Jan.-Mar. 
P.. E, P. Q.-369 February 27, 1935. 
PACKING MATERIALS FOR NURSERY STOCK, PLANTS, AND SEEDS 
(Effective Mar. 4, 1935; supersedes H. B.-132) 
All packing - materials employed iu connection with importations of nursery 
stock and otber plants and seeds under Quarantine No. 37 are subject to- 
approval as to such use by the Bureau of Entomology and Plant Quarantine. 
GENERAL PACKING MATERIALS FOE NURSERY STOCK, PLANTS, AND SEEDS 
Such materials as sphagnum, ground peat, coconut fiber, osmunda liber, 
buckwheat hulls, cereal straw (except rice straw), cereal chaff (except rice 
chaff), excelsior, shavings, sawdust, and charcoal are authorized for use with 
nursery stock, plants, and seeds generally, provided they are free from sand, 
soil, or earth and have not been previously used as packing or otherwise with 
living plants. 
Packing materials other than those specifically mentioned may be authorized 
when it has been determined that their use does not involve a risk of intro- 
ducing insect pests and plant diseases. 
SOIL AUTHORIZED AS PACKING FOR BULBS, CORMS, NUTS, AND SEEDS 
Regulation 7, Quarantine No. 37, provides that the requirements as to free- 
dom from sand, soil, or earth shall not apply to sand, soil, or earth used for 
packing the articles enumerated in items nos. 1, 4, and 5 of regulation 3 when 
such sand, soil, or earth has been previously sterilized or otherwise safe- 
guarded in accordance with methods prescribed by the Bureau of Entomology 
and Plant Quarantine under the supervision of an authorized inspector of 
the country of origin, such sterilization or safeguarding to be certified to by 
the duly authorized inspector of such country of origin. This provision i& 
also extended to bulbs and corms imported under special permit under regula- 
tion 14. It should be emphasized that the use of sterilized soil and of naturally 
sterile soil as described below is not authorized for plants or plant products 
other than bulbs, corms, nuts, and seeds. 
(1) The prescribed method of sterilization is as follows: The sand, soil, 
or earth must be brought to a temperature of 100° C. and held at or above that 
temperature for a period of 1 hour. Any method which will maintain the 
heat throughout the whole mass at the required temperature for this length 
of time will be satisfactory to the Bureau. The sterilization must be performed 
under the supervision of a duly authorized inspector of the country of origin 
and must be certified to by such inspector. 
(2; Under the provisions of regulation 7 for the use as packing with bulbs, 
corms, seeds, and nuts of soil which has been otherwise treated the following 
are authorized: 
(a) Subsoil from Japan, collected and handled under the supervision of 
the imperial plant quarantine station at Yokohama, Japan, when certified by 
the director of that station that the subsoil has been taken from at least 
2 feet below the surface, and that it has been sifted, dried, and stored so 
as to prevent contamination by insects and diseases. 
(b) Dune sand from Belgium and the Netherlands, taken from a depth 
of 5 feet or more below the surface and so certified by an inspector of the 
phytosanitary service of the country concerned. 
(c) Coral sand from Bermuda, uncontaminated by surface soil, and certified 
as such by the Director of .Agriculture of Bermuda. 
Lee A. Strong, 
Chief, Bureau of Entomology and Plant Quarantine. 
ANNOUNCEMENTS RELATING TO WHITE PINE BLISTER RUST 
QUARANTINE (NO. 63) 
MODIFICATION OF WHITE PINE BLISTER RUST QUARANTINE REGULATIONS 
INTRODUCTORY NOTE 
The following amendment adds Minnesota to the list of States named in 
paragraph (c), regulation 3, which have established white pine blister rust 
