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Ir. the event that inspection of imported plant material reveals 
the presence of weed seeds of quarantine importance, the material 
must he cleaned under the direction of the Quarantine Inspection 
Service. 
The importation into the Union of Soviet Socialist Republics 
of species of weed plants, their seeds and other parts, is allowed for 
scientific research only and under a special permit of the Quarantine 
Inspection Service in each case. The importation of such material is 
allowed only through the Institute of Botany of the Academy of Sciences 
(3. I. N.) and the Bureau of Introduction of the All-Union Institute of 
Plant Industry (V. I. R.). 
A list of foreign countries ir. which the species of weeds 
above named are known to exist is compiled by the Secretary of 
Quarantine, People's Commissariat of Agriculture. 
LIST OF DISEASES AMD PESTS TECLARET INJURIOUS* 
(Published under the authority of decree 2to. 259B , of Kov. 20, 1934, 
entitled "Safeguarding the Territory of the U. S. S. R. against the 
Introduction and Distribution of Agricultural and Forest Pests." 
Tho list includes the principal pests and diseases of agri- 
cultural plants subject to u r; ntine restrictions under the provi- 
sions of the Decree of Foreign Plant Quarantine. 
Zhe quarantined insects and diseases included in the list are 
arranged in three groups in accordance with the degree of quarantine 
restrictions to which controlled imported shipments are subject. 
Group 1 includes the most injurious species of insects and 
diseases of agriculture that are not known to occur in the Union of Soviet 
Socialist Republics. To prevent the possibility of introducing into the 
Union of Soviet Socialist Republics the pests named in this group an embargo 
is placed upon products that may serve as carriers of those pests and thus 
effect their introduction. 
A complete prohibition may be established, as for example, on 
potatoes and other tuberous products and root-crops, regardless of 
the country of origin. Rie prohibition may be limited to particular 
countries infested by certain insects and diseases within a given 
group, for example, in the case of citrus propagating material, which 
is excluded only from countries in which citrus canker occurs, etc. 
* This list includes a statement of the geographical distribution of 
each pest or disease, including distribution in the United States. 
Since the information with respect to distribution in foreign countries 
is not essential in this circular, reference is made to distribution 
in the continental United States, Hawaii, and Puerto Rico only. 
