g4 BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE [Apr.-June 
Period of treatment. — Two and one-half hours. 
Preparation of plants. — The treatment is to be applied only to plants with 
bare roots or in 8-inch pots, or smaller, or in soil balls not larger than 8 inches 
in diameter or thicker than 8 inches when not spherical. The soil should not 
be puddled or saturated. With wet material, drying for a period of 12 hours 
is advisable before treatment. The plants should be stacked on racks or 
separated so that the gas can have access to both top and bottom surfaces of 
pots or soil balls. While not essential that the balls be completely separated 
from each other, they should not be jammed tightly together. 
Varieties of plants. — The list of plants, including greenhouse, perennial, and 
nursery-stock types treated experimentally is subject to continual expansion 
and, moreover, is too great to include in these instructions. Such a list, in- 
cluding also those which have been injured by the treatment, will be supplied 
on request. 
(ii) Fumigation of straivberry plants in shipping crates of field-packed baskets 
Temperature. — The temperature of the plants and air must be at least 60° F. 
during the entire fumigation period. 
Dosage. — Three pounds of methyl bromide per 1,000 cubic feet, including the 
space occupied by the load. 
Period of treatment.— ¥ owe hours. 
Preparation of plants. — Strawberry plants may be fumigated either bundled 
and packed in damp moss in slatted shipping crates or in field-packed baskets 
of 1 bushel or less. The load in the fumigation space should be arranged to 
allow the gas to enter from all sides of the containers. 
Varieties of plants. — This treatment has been authorized for strawberry 
plants only. 
(m) Treatment of Plants Before Digging 
(1) CARBON DISULFIDE EMULSION 
Equipment. — Strips or squares of 24-gage galvanized iron, 10 inches wide 
of the proper size, and watertight cans or tubs must be provided. 
Season. — This treatment must not be used when adult beetles are present. 
Temperature. — The treatment must not be applied when the temperature of 
the soil at a depth of 6 inches is below 40° F., or it is anticipated that the 
temperature will fall below this during the period of treatment. 
Dosage. — The dosage of stock emulsion which must be used is dex^endent on 
the minimum soil temperature anticipated during the period of the treat- 
ment. Schedules 1, 2, and 3 in tables 2 and 3 give the dosages required for 
the treatment of plant balls of various sizes. 
Table 2. — Dosage for circular collars 
Diameter 
of ball to 
be dug 
(inches) 
Diam- 
eter of 
collar 
Yfater 
Stock carbon disulfide 
emulsion 
Diameter 
of ball to 
be dug 
(inches) . 
Diam- 
eter of 
collar 
Water 
Stock carbon disulfide 
emulsion 
Sched- 
ule 
No. 1 
40°-50° 
F. 
Sched- 
ule 
No. 2 
50°-60° 
F. 
Sched- 
ule 
No. 3 
60°-70° 
F. 
Sched- 
ule 
No. 1 
40°-50° 
F. 
Sched- 
ule 
No. 2 
50°-60° 
F. 
Sched- 
ule 
No. 3 
60°-7O° 
F. 
Cubic 
Cubic 
Cubic 
Cubic 
Cubic 
Cubic 
centi- 
centi- 
centi- 
centi- 
centi- 
centi- 
Inches 
Gallons 
meters 
meters 
meters 
Inches 
Gallons 
meters 
meters 
meters 
12 or less. 
18 
4.5 
31 
26 
20 
24 
36 
17. 5 
119 
99 
80 
14.... 
21 
6.0 
41 
34 
27 
25-27 
39 
21.0 
143 
119 
95 
18 
27 
30 
33 
10.0 
12.0 
15.0 
68 
82 
102 
57 
68 
85 
45 
54 
68 
28-30 
42 
45 
48 
24.0 
27.5 
31. 5 
164 
187 
215 
136 
156 
179 
108 
125 
143 
20 
33.... 
22 
36 
