4 BUREAU OF ENTOMOLOGY AND PLANT QUARANTINE 
ably representative set of data are recorded showing the hosts and countries of 
origin involved — a contribution to the study of the types of diseases actually 
transported in commerce. 
COMMON PESTS INTERCEPTED 
In order to give a complete picture of the interception work it is necessary to 
call attention, however briefly, to the thousands of interceptions of common 
pests. Some of these pests are cosmopolitan, others are not so widely distributed 
but are well established in this country. Two of the diseases, Elsinoe phaseoU 
and Helminthosporium allii, have not been reported as' occurring in the United 
States mainland but are intercepted in such numbers that detailed records of 
them are no longer made. Some of the interceptions of diseases known to occur 
in this country doubtless represent forms or strains not found here. Great 
numbers of common pests are discarded without any record being made of them, 
but enough are recorded to give a reasonably representative sample. In the 
following summaries of these records the numbers following the names jof organ- 
isms indicate the number of countries of origin from which the pest was 
intercepted and the total number of interceptions recorded. 
INSECTS 
Common insects intercepted 10 or more times, and recorded, included Acan- 
thoscelides ohtectus (10 — 185), Ahasverus advena (23 — 113) Anthonomus eugenii 
(1 — 6,068), Aonidiella aurantii (19 — 618), Aphis gossypii (8 — 177), A. rumicis 
(4 — 13), Araecerus fasciculatus (14 — 26), Aspidiotus camelliae (9 — 32), A. cyan- 
ophylli (12 — 66), A. hederae (20 — 141), A. lataniae (13 — 232), A. perniciosus 
(10 — 34), Aulacaspis pentagona (7 — 15), Brevicoryne brassicae (13 — 19), Car- 
pocapsa pomonella (13 — 89), Cathartus quadricollis (4 — 165), Cerataphis lataniae 
(11 — 28), Chionaspis citri (9 — 19), Chrysomphalus aonidum (32 — 5,368), C dic- 
tyospermi (22 — 752), Coccus hesperidum (21 — 77), Diaspis boisduvalii (20 — 243), 
D. hromeliae (6 — 321), D. echinocacti (9 — 28), Ephestia cautella (9 — 20), Gnori- 
moschema operculella (29 — 203), Heliothis armigera (11 — 3,390), H. virescens 
(6 — 106), Hippodamia convergens (1 — 192), Howardia biclavis (7 — 46), Ischnaspis 
longirostris (8 — 15), Laphygma frugiperda (3 — 329), Lasioderma serricorne (10 — 118) 
Lepidosaphes beckii (50 — 3,938), L. gloverii (14 — 772), L. ulmi (16 — 47), Macro- 
siphum solanifolii (8 — 209), Myzus persicae (18 — 309), Necrobia rufipes (15 — 56), 
Oryzaephilus surinamensis (12 — 98), Parlatoria pergandii (19 — 4,012), P. proteus 
(14 — 62), Pinnaspis aspidistrae (12 — 61), P. minor (11 — 129), Plodia interpunc- 
tella (9 — 378), Pseudococcus adonidum (6 — 26), P. brevipes (15 — 435), P. citri 
(20—73), P. maritimus (12 — 42), Rhizoglyphus hyacinthi (11 — 127), Rhizopertha 
dominica (6 — 54), Rhopalosiphum pseudobrassicae (2 — 72), Saissetia hemi- 
sphaerica (21 — 136), S. nigra (7 — 46), S. oleae (11 — 40), Selenaspidus articulatus 
(23 — 79), Sitophilus oryza (18^1,113), Sitotroga cerealella (5 — 21), Tenebroides 
mauritanicus (12 — 56), Thrips tabaci (22 — 347), Tribolium castaneum (9 — 282), 
T. confusum (9 — 97), and Typhaea stercorea (12 — 93). 
In addition to the listed species of common insects, there were 5,249 intercep- 
tions belonging to 693 different species which were not deemed to be of sufficient 
importance from the plant-quarantine viewpoint to warrant listing them by species. 
Total of insects included in this paragraph, 39,711. 
DISEASES 
Common plant diseases intercepted included Actinomyces scabies (37 — 469), 
Albugo Candida (4 — 78), Alternaria brassicae (11 — 37), A. herculea (17 — 33), A. 
radicina (5 — 10), A. solani (1 — 108), Aspergillus niger (30 — 313), Bacillus caroto- 
vorus (21 — 63), Bacterium maculicola (9 — 19), B. marginatum (7 — 300), B. rhizo- 
genes (3 — 6), B. tumefaciens (6 — 23), B. vesicatorium (4 — 2,472), Botrytis cinerea 
(28 — 168), Capnodium citri (17 — 55), Cephalothecium roseum (16 — 71), Ceratosto- 
mella adiposum (4 — 38), C. paradoxa (12 — 212), Cercospora beticola (4 — 39), C. 
capsici (3 — 344), C. rosicola (4 — 38), Cladosporium fulvum (2 — 168), C. herbarum 
(3 — 31), Colletotrichum circinans (5 — 120), C lindemuthianum (11 — 145), Conio- 
thyrium fuckeli (5 — 6), Corticium vagum (32 — 517), Diaporthe phaseolorum (3 — 108), 
Diplocarpon rosae (6 — 29), Diplodia natalensis (20 — 39), Elsinoe fawcettii (20 — 55), 
E. phaseoli (2 — 304), Erysiphe graminis (2 — 23), Fusarium moniliforme (2 — 18), 
Gloeosporium limetticolum (11-123), Glomerella cingulata (20 — 533), Graphiola 
phoenicis (3—7), Helminthosporium allii (10 — 844), H. sativum (2 — 21), Heterodera 
marioni (16 — 44), Macrosporium tomato (4 — 1,672), Melanconium sacchari (3 — 4), 
