LIBRARY 
STATE «-ANTJ|Q£J!D 
United States Department of Agriculture 
BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 
SERVICE AND REGULATORY ANNOUNCEMENTS 
LIST OF INTERCEPTED PLANT PESTS, 1936 
(List of Pests Recorded During the Period July 1, 1935, to June 30, 1936, 
Inclusive, as Intercepted in, on, or with Plants and Plant Products Entering 
United States Territory) 
INTRODUCTION 
This paper covers the twenty-third year for which pest interception lists have 
been issued. It is the purpose of these papeis to present data that will give the 
reader a reasonably complete picture of the condition of the plant materials in- 
spected, from the standpoint of plant pests present, and that will indicate the 
wide variety of materials from almost all parts of the world which have been 
inspected for the presence of pests, both known and unknown, and on which 
something of interest was found. 
In order to keep the paper from becoming too bulky as the number of inter- 
ceptions has increased, it has been necessary from time to time to eliminate many 
items from the detailed list that make up the bulk of the paper. More or less 
cosmopolitan pests are now listed in short paragraphs under the heading, "Com- 
mon Pests Intercepted", and others not so widely distributed are included in 
these paragraphs whenever ample records of theii interception have been pub- 
lished. Drastic cuts in the items to be included were necessitated by the marked 
increase in the number of interceptions this year and led to the omission of thou- 
sands of records of partially determined insects from the detailed list in this paper. 
Many of these insects determined to genus, family, or other large subdivision only 
may be far more important than some of the items included in the detailed list, 
but information available is inadequate to make possible evaluation of their 
economic status. These interceptions are summarized, under the heading, "In- 
completely Determined Pests." A few unnamed new species and partially de- 
termined insects new to our records and believed to be important have been in- 
cluded in the paper. Determinations covering interceptions made the last few 
days of the year are received after the end of the year and are included in the list 
for the following year. Furthermore it is obvious that determinations cannot 
be made promptly in all cases, especially where difficult material is involved. 
Hence some delayed determinations of insects and diseases intercepted in the 
previous year appear in the list. This list is based on data covering intercepted 
plant pests for which determinations were received and indexed during the fiscal 
year, including those intercepted in, on, or with plants and plant products (1) 
imported, (2) offeied for but refused entry, (3) held as ships' stores, etc., and 
hence not imported through customs, (4) offered for entry for immediate export 
or for immediate transportation and exportation in bond, and (5) in domestic 
shipments reaching the mainland from Hawaii and Puerto Rico. 
As in the past, the list has been compiled from the files maintained in the 
Washington office. Information supplied by State and customs officials acting 
as collaborators of the Bureau has supplemented routine reports of regular em- 
ployees. Most of the insect determination are made by specialists of the Bureau 
and some of the plant- disease determinations by specialists of the Bureau of 
Plant Industry. The States of California and Florida and the Territory of 
Hawaii have staffs of specialists who make most of their determinations. In 
addition to the items shown in this paper, in one form or another, there were 
many thousands of lots of material intercepted in which the organism concerned 
could not, because of its condition, be determined. 
Statements as to the origin of plant materials inspected cannot always be 
verified, but every effort is made to determine the origin as accurately as possible. 
Obviously doubtful items are omitted from the lists of interceptions under 
countries concerned. 
The number of interceptions indicated for any item in any of these lists repre- 
sents the number of lots of infected or infested plants or plant products which 
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