(1) Class I. — Nurseries, greenhouses, and other premises concerned in the 
movement of nursery and ornamental stock on or within approximately 500 
feet of which no infestation has been found may be classified as class I. 
Upon compliance with the requirements of subsection (6) of this section, nur- 
sery and ornamental stock may be certified by the inspector for shipment from 
such premises without further inspection, and without meeting the safe- 
guards prescribed as a condition of interstate shipment of plants originating 
in nurseries or greenhouses of class III. 
(2) Class III. — (a) Nurseries, greenhouses, and other premises concerned 
in the movement of nursery and ornamental stock on which either grubs in 
the soil or one or more beetles have been found, will be classified as class III. 
Such classification also may be given to nurseries, etc., in localities known to 
be generally infested where one or more beetles or grubs are found in the 
immediate proximity (within approximately 500 feet) of such nurseries, etc., 
on adjacent property or properties. In the case of nursery properties, under 
single ownership and management, but represented by parcels of land widely 
separated, such parcels may be independently classified either as class I or clasg 
III upon compliance with such conditions and safeguards as shall be required 
by the inspector. Similarly, unit nursery properties, which would otherwise 
fall in class III, may be open to subdivision, for the purpose of rating such 
subdivisions in classes I or III, when in the judgment of the inspector such 
action is warranted by recent and scanty infestation limited to a portion 
of the nursery concerned : Provided, That the subdivision containing the infesta- 
tion shall be clearly marked by boundaries of a permanent nature which shall be 
approximately 500 feet beyond the point where the infestation occurs. 
(&) Upon compliance with subsections (3) and (6) of this section, nursery 
and ornamental stock may be certified by the inspector for shipment from 
such premises under any one of the following conditions: (/) That the roots 
shall be treated by means approved by the Bureau of Entomology and Plant 
Quarantine in manner and by method satisfactory to the inspector; or (ii) 
in the case of plants in which the root system is such that a thorough inspec- 
tion may be made, that the soil shall be entirely removed from the stock by 
shaking or washing, or (Hi) that it shall be shown by evidence satisfactory 
to the inspector that the plants concerned were produced in a certified 
greenhouse. 
(3) Greenhouses of class III may be certified upon compliance with all the 
following conditions with respect to the greenhouses themselves and to all 
potting beds, heeling-in areas, hotbeds, coldframes, and similar plots : 
(a) Ventilators, doors, and all other openings in greenhouses or cold- 
frames on premises in class III shall be kept screened in manner satisfactory 
to the inspector during the period of flight of the beetle, namely, south of 
the northern boundaries of Maryland and Delaware between June 1 and 
October 1, inclusive, or north thereof between June 15 and October 15, inclusive. 
(6) Prior to introduction into nurseries or greenhouses, sand, soil, earth, 
peat, compost, or manure taken from infested locations or which may have 
been exposed to infestation, must be sterilized or fumigated under the direc- 
tion and supervision of, and in manner and by method satisfactory to, the 
inspector. If such treated sand, soil, earth, peat, compost, or manure is not 
to be immediately used in such greenhouses, it must be protected from possible 
infestation in manner and by method satisfactory to the inspector. 
(c) All petted plants placed in certified greenhouses of class III and all 
potted plants to be certified for interstate movement therefrom (i) shall be 
potted in certified soil; (Li) shall, if grown outdoors south of the northern 
boundaries of Maryland and Delaware at any time between June 1 and Octo- 
ber 1, inclusive, or north thereof at any time between June 15 and October 
35, inclusive, be kept in screened frames while outdoors; (Hi) shall, if grown 
outdoors during any part of the year, be placed in beds in which the soil 
or other material shall have been treated in manner and by method approved 
by the Bureau of Entomology and Plant Quarantine to eliminate infestation j 
and (iv) shall comply with such other safeguards as may be required by the 
inspector. 
(4) Cut flowers and other parts of plants without roots or soil may be 
certified for movement either (a) when they have been inspected by an in- 
spector and found free from infestation, or (o) when they have been grown in 
a greenhouse of class I or in a certified greenhouse of class III and are trans- 
ported under such safeguards as will in the judgment of the inspector prevent 
infestation. (See also sec. A (3) of this regulation.) 
