fcte./y/*'.' 
Bur. Ent. & P. Q. *»wtairi0% ssue( | ^f#mber 1942 
United States Department of Agriculti 
BUREAU OF ENTOMOLOGY AND pSaP?T QUA^ANll^] 
SERVICE AND REGULATORY ANN<51 
LIST OF INTERCEPTED PLANT PESTS, 1941 
(List of Pests Recorded During the Period July 1, 1940, to June 30, 1941, Inclusive, 
as Intercepted in, on, or with Plants and Plant Products Entering United States 
Territory.) 
INTRODUCTION 
This report covers the twenty-eighth year for which records of interceptions 
have been issued. The data in the main detailed table are arranged under 
alphabetical lists of the pests and pathogens, as was done last year for the first 
time, but three columns headed "Consumption," "Nonentry," and "Propagation" 
have been substituted for the five columns headed "Cargo," "Mail," "Baggage," 
"Quarters," and "Stores." Items in the "Consumption" column include pests 
and pathogens found in, on, or with material offered for entry for consumption, 
as food or feed, and for use in manufacturing or processing, as well as packing for 
these and other materials, whether or not their entry was permitted. Since such 
materials are often so distributed or so handled as to enable accompanying pests 
to become established, items in this column may represent considerable risk. 
Items in the "Nonentry" column include organisms found associated with non- 
entry material, e. g., in stores and quarters, or en route to other countries. Such 
findings usually represent a relatively smaller risk, as temporary safeguarding is 
all that is necessary, although flying insects, air-borne pathogens, and garbage 
may require prompt attention to eliminate danger. Items in the "Propagation" 
column include some of the insects, pathogens, and related or associated forms of 
interest found in, on, or with plant material offered for entry for propagation 
purposes and believed to be associated with that material. Insects and diseases 
found in, on, or with the packing materials and clearly not associated with the 
propagation material would be listed in the "Consumption" column, if listed at all. 
While the quantity of material offered for entry for propagation is relatively small, 
interceptions on such material are important because if the parasites were allowed 
to go forward they would be likely to become established and distributed with 
their hosts. Thus the three new groups have been adopted as giving a more 
accurate reflection of the relative pest risk represented by the items listed therein 
than did the five groups used heretofore. 
It may be noted that a considerable proportion of the pests listed in the detailed 
table were found in, on, or with material for propagation in spite of the relatively 
small volume of such material. Among the factors contributing to this result are 
the more intensive inspection of such of this material as is entered in limited 
quantities under special permit, the fact that some of this material represents 
types not previously imported in such volume or over a long enough period of 
time to insure establishment of their pests, and the further fact that much of it 
comes directly or indirectly from relatively new or unusual points of origin. 
While many of the plant materials entered in large quantities carry few new 
pests, there are, from time to time, initial shipments of new products as well as of 
old products from new areas. Then, too, faster transportation and refrigeration 
aid additional pests from various parts of the world in gaining a foothold in areas 
from which we have imported for many years. Many of our relatively common 
pests and diseases vary considerably on different hosts and under different envi- 
ronmental conditions. New foreign insects and, especially, new foreign plant 
diseases may so closely resemble variants of species already established here that 
extreme care is required to detect them. Any insect or disease record which has 
not been published sufficiently often to establish it as a more or less regular finding 
may be included in the detailed table as a matter of interest. 
467458—42 2 1 
