74 BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE [Apr.-June 
(6) 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, 
provided, (i) , there are maintained on the premises subdivided class I areas, 
certified houses, frames, or plots, or other certified areas, or (ii) there is a 
legitimate need for interstate or intradealer certification of such stock. Such 
classification will not be granted to nurseries, greenhouses, and other premises 
that do not maintain certified or subdivided areas and require only infrequent 
certification. Such classification also may be given to nurseries, etc., 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 prop- 
erties. In the case of nursery properties under single ownership and manage- 
ment but represented by parcels of land widely separated, such parcels may 
be independently classified either as class I or class 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 infestation shall be clearly marked by 
boundaries of a permanent nature which shall be approximately 500 feet beyond 
the point where the infestation occurs. 
(b) Upon compliance with paragraphs (7), (10), and (11) of this regula- 
tion, nursery and ornamental stock may be certified by the inspector for ship- 
ment from such premises under any one of the following conditions : (i) 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 
inspection may be made, that the soil shall be entirely removed from the 
stock by shaking or washing; or (iii) that it shall be shown by evidence satis- 
factory to the inspector that the plants concerned were produced in a certified 
greenhouse. 
(7) 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 coldframes 
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, if contaminated 
with vegetable matter, 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 direction and supervision of, and in manner and by method 
satisfactory to the inspector. If such 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. 
(o) All potted 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 ; (ii) shall, if grown outdoors south of the northern 
boundaries of Maryland and Delaware at any time between June 1 and October 
1, inclusive, or north thereof at any time between June 15 and October 15, 
inclusive, be kept in screened frames while outdoors ; (Hi) shall, if grown out- 
doors 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; and (iv) 
shall comply with such other safeguards as may be required by the inspector. 
(8) 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 inspector and 
found free from infestation, or (6) when they have been grown in a greenhouse 
of class I or in a certified greenhouse of class III and are transported under 
such safeguards as will in the judgment of the inspector prevent infestation. 
(See also par. (3) of this regulation.) 
(9) Nursery and ornamental stock originating on or moved from unclassified 
premises may be certified by the inspector under either one of the following 
conditions: (a) That the soil shall be entirely removed from the stock, or (6) 
