1942] 
SERVICE AND REGULATORY ANNOUNCEMENTS 
57 
tern to the soil surface from the spout of a sprinkling can or other vessel with 
a similar spout, held no more than 6 inches above the soil surface. 
(vi) Safety zone. — In addition to the area desired to be certified, a strip 3 feet 
wide must be treated around the entire coldframe, plunging bed, or heeling-in 
ground. No plants will be certified from this strip. In the case of coldframes, 
etc. extending into the ground to a depth of 12 inches or more, no safety zone is 
required. 
(vii) Marking. — In the case of coldframes, etc., having fixed boundaries, proper 
designations will be made on them by the inspector. In all other cases the nursery- 
men shall furnish suitable stakes, at least 4 inches square and 30 inches long, to be 
placed at the boundaries of the certified plots and marked by the inspector. 
(viii) Period of treatment. — The area must remain undisturbed for a period of 
48 hours after treatment. 
(ix) Alternative treatment. — If 1-square-yard collars are used in treating 
frames, plunging beds, and heeling-in areas, the dosages and methods of procedure 
listed below for treatment of soil about the roots of plants may be used. 
******* 
Treatment of Soil About the Roots of Plants 
(m) treatment of plants before digging 
(3) Methyl iromide solution — collar treatment 
(i) Season. — The treatment can be applied at any time when conditions are 
suitable between October 1 and May 15. 
(ii) Equipment. — The equipment required is the same as that under TREAT- 
MENT OF SOIL IN ABSENCE OF PLANTS (subparagraph (6) of paragraph 
(k)) except that collars are necessary. 
(iii) Preparation of solution. — The required solution must be prepared in 
accordance with the directions of the inspector. 
(iv) Dosage, solution, concentration, and soil temperatures. — The dosage is at 
the constant rate of 3 gallons per square yard. The percentage concentration 
of methyl bromide in solution, by volume, is dependent upon the minimum soil 
temperature within the top 6 inches, as follows : 
Minimum soil temperature in Percentage concentration of 
top 6 inches (°F.) : methyl bromide 
47 to 51, inclusive 0. 100 
52 to 56, inclusive . 075 
57 to 62, inclusive .050 
63 to 67, inclusive . 040 
68 to 72, inclusive . 025 
73 and over . 015 
(v) Condition and type of soil.-— There are no limitations so long as there is no 
standing water on the area to be treated and all of the solution enters the soil 
within 30 minutes after application. 
(vi) Preparation of collar areas. — The area must be free from weeds and debris 
and must be practically level. Leveling can be expedited by filling in and sub- 
sequent tamping to produce a uniformly packed subsurface for the application. 
The entire surface of the collar about the plant treated must be loosened to a depth 
of 1 inch. The collar should be set so that the solution will not break out beneath 
or through it. 
(vii) Safety area. — The collar must be of sufficient size so that a safety margin 
of soil of at least 2 inches all around remains when the treated nursery stock unit 
is dug for balling. 
(viii) Withdraival and application of solution. — The solution is to be with- 
drawn from the preparation-drum through a hose extending to the bottom of the 
dosage-measuring vessel. It must be poured from the open top of the vessel onto 
the collar area quickly and without unnecessary splashing. Immediately there- 
after the soil within the collar must be smoothed off without splashing' so that 
the entire surface is uniformly submerged. 
(ix) Use period. — If the drum is tightly sealed between dosage withdrawals 
the solution may be used at any time within 24 hours after preparation. While 
in storage between treatments within this period the drum must be shaded. 
495903—42 2 
