1942] 
SERVICE AND REGULATORY ANNOUNCEMENTS 
33 
Preparation of plants. — Excess soil should be removed and the mass reduced as 
much as possible without injuring the roots. The plant ball should be moist, but 
not wet. Pots must be removed from potted plants. When burlap on balled 
plant is of coarse weave, it may be left on the balls, but when it is closely woven, 
it must be removed. 
Preparation of plunging soil. — The paradichlorobenzene must be thoroughly 
mixed with a light sandy loam, or sand, which is moist but not wet, and free from 
lumps, stones, and debris. It must be mixed immediately before using. 
Care of plants during treatment. — If it is necessary to water the plants during the 
treatment to prevent desiccation, the operation must be limited to a light syring- 
ing, under the supervision of an inspector. During the treating period care should 
be used to assure that the natural air movement will aid in reasonably rapid dis- 
persal of the fumigant that escapes from the soil to prevent it from being held about 
the foliage of the treated plants. 
Care of plants after treatment. — It is advisable to avoid excessive watering of the 
plants after treatment in order to permit any residual gas to escape from the plant 
balls. 
(i) Complete Coverage 
Temperature. — The temperature of both the treating soil and the soil ball must 
not be less than 50° F. during the period of treatment. To prevent injury to the 
plants, it should not go above 65°. 
Dosage. — Ten pounds per cubic yard of mixing soil (6 ounces per cubic foot) 
for soil balls up to 6 inches in diameter at the narrowest dimension. Twenty 
pounds per cubic yard of mixing soil (12 ounces per cubic foot) for soil balls from 
6 to 8 inches in diameter at the narrowest dimension. 
Application. — Spread a layer of the treated plunging soil on a smooth hard 
surface, such as a floor or bench, and then place a row of plants, with the balls 
spaced at least 1 inch apart, on this soil. Fill the spaces between the plant balls 
with treated soil and cover the plant balls to a depth of 1 inch. Then place about 
1 inch of treated soil against the row of plants. This operation is repeated until 
all the plants are plunged. 
Period of treatment. — The plants must be left undisturbed for a period of 3 days. 
(ii) Side Application 
Temperature, dosage, period of treatment. — The various combinations of dosage 
and exposure which may be used at different temperatures are given in table 1. 
It is desirable to maintain the temperature fairly constant. The temperatures 
given at the head of the column in table 1 are the minimum temperatures during 
the period of treatment. 
******* 
Application. — Spread a layer of the treated plunging soil on a smooth hard sur- 
face, such as a floor or bench, and then place a row of plants, with the balls spaced 
at least 1 inch apart, on this soil. Fill the spaces between the plant balls with 
treated soil, taking care not to get the treated soil in contact with the stems of the 
plants, and cover the upper side of the plant balls with treated soil to within 2 
inches of the stems. Then, place about 1 inch of treated soil against the row of 
plants. The operation is repeated until all the plants are plunged. 
(7 C. F. R. § 301.48; sec. 8, 39 Stat. 1165, 44 Stat. 250; 7 U. S. C. 161.) 
Done at Washington, D. C, this 15th day of May 1942. 
P. N. Annand, 
Chief. 
ANNOUNCEMENT RELATING TO NURSERY STOCK, PLANT, 
AND SEED QUARANTINE (NO. 37) 
B. E. P. Q. 523, amending P. Q. C. A. 278, revised Effective May 11, 1942 
TITLE 7 — AGRICULTURE 
Chapter III — Bureau of Entomology and Plant Quarantine 
Part 319 — Foreign Plant Quarantine Notices 
additional quantity limits for plants imported for propagation purposes 
Chapter III, Title 7, Code of Federal Regulations, § 319.37-14a [P. Q. C. A. 
278, Revised, July 14, 1931] is hereby amended effective May 11. 1942, bv adding 
