1939] 
SERVICE AND REGULATORY ANNOUNCEMENTS 
63 
pounds per cubic yard of mixing soil (12 ounces per cubic foot) for soil balls 
from 6 to 8 inches in diameter at tbe narrowest dimension. 
Application. — Spread a layer of tbe treated plunging soil on a smootb bard 
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 opera- 
tion is repeated until all the plants are plunged. 
Period of treatment. — The plants must be left undisturbed for a period of 
5 days. 
(it) 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 tem- 
peratures given at the head of the column in table 1 are the minimum tempera- 
tures during the period of treatment. 
Table 1. — Temperature, dosage, and period of treatment for 
paradich lorob enzene 
Width or depth of plant ball (inches) 
Crystals 
per cubic 
yard of 
plunging 
soil 
Period of treatment 1 required when the minimum 
Fahrenheit temperature is within the range 
of— 
45°-49° 
50°-54° 
55°-59° 
60°-64° 
65°-69° 
70°-74° 
Pounds 
Days 
Days 
Days 
Days 
Days 
Days 
(») 
0) 
6 
10 
9 
7 
5 
Up to 2 
1 1 
10 
9 
7 
6 
5 
5 
4 
4 
3 
2 
2 
I 20 
5 
5 
4 
3 
2 
1 
f 1 
0) 
0) 
(') 
« 
10 
6 
2to4 
! 5 
1 10 
0) 
9 
10 
8 
10 
8 
9 
7 
8 
6 
4 
3 
I 20 
7 
7 
6 
6 
5 
2 
f 1 
(') 
0) 
0) 
V) 
P) 
(') 
4 to 6 -U~._ v . 
5 
(') 
0) 
0) 
© 
0) 
] 10 
0) 
<») 
0) 
(') 
9 
7 
I 20 
C 1 ) 
0) 
8 
6 
4 
1 Exposure period more than 10 days. 
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, 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. 
(5) METHYL BROMIDE FUMIGATION 
Equipment. — A fumigation chamber, of approved design, equipped with 
vaporizing, air-circulating, and ventilating systems must be provided. 
Application. — After the chamber is loaded, the methyl bromide must be va- 
porized within it. Tbe air within the chamber must be kept in circulation 
during the period of fumigation. At the completion of the treatment, tbe 
chamber must be well ventilated before it is entered and the plants removed. 
The ventilating system should also be in continuous operation during the entire 
period of removal of tbe fumigated articles. 
(/) Fumigation of plants, with or without soil 
Temperature. — The temperature of the soil (with bare rootstock, the root 
spaces) and air must be at least CV 3 F. during tbe entire fumigation period. 
Dosage. — Two and one-half pounds of met by 1 bromide per 1,000 cubic feet, 
including the space occupied by the load. 
167471—39 2 
