June 1938] SERVICE AXD REGULATORY AXXOUXCEMEXTS 5 
alho-airum on dahlia from Belgium, Germany, Italy, and Netherlands, on Ere- 
murus from Netherlands, and on Ficus from Italy. 
Numerous interceptions of cereal rusts and smuts were made which may repre- 
sent strains not present in this country, but as their status could not be determined 
and the species are common no detailed record of them was prepared. 
VIRUS DISEASES 
Virus diseases constitute a serious quarantine problem because, though destruc- 
tive, they cannot be detected, even when present, in most types of plant material 
offered for entry, and even if detected their specific identity could not be deter- 
mined in man}^ cases. Reports were received of heavy losses from virus diseases 
in imported lily bulbs, diseases which could not be detected in the bulbs at the time 
of entry and inspection. 
Mosaic was intercepted in Gloriosa siiperha from the Virgin Islands and lilies 
from Bermuda: spotted wilt of tomato, was intercepted from Mexico. 
NEMATODE INTERCEPTIONS 
Twenty interceptions of Anguina tn'tici were made in seed wheat from Afghan- 
istan and three in wheat from Turkey'. Aphelenchoides bicaudatus was intercepted 
in ginger from China: A. fragariae in lily-of-the-valley from Germany and lilies 
from Netherlands; A. limheri in dahlia from Germany; .4. parietinuF. in various 
hosts from Azores, Belgium, China, Denmark, Dominican Republic, England, 
France. Germany, Italy, Jamaica, Japan, and Netherlands: Aphelenchus avenae 
on various hosts from Belgium, Denmark, France, Germany, Italy, Morocco, 
Netherlands, and Union of South Africa: DUulenchus dipsaci in various hosts from 
Denmark, England, Prance, Germany.. Guernsey, Netherlands, Norway, Poland, 
Sweden, and Uruguay: D. intermedius on yam from Puerto Rico; Heicrodera inarioni 
on nev,- or unusual hosts for our interception files, including Adromischus trigynus 
from Germany, Anemone nemorosa and its variety robinso?iJana from Canada, 
A. iessiri from Germany, Coptis quinquefolia from Japan, Convolvulus incanus 
from England, Echeveria spp. from Mexico, Hibiscus sp. from Mexico, Lobivia 
graulichi and L. schuldii from Japan, Melocactus matanzanus from Cuba; Pachy- 
rhizus erosus from China, Pachysandra terminalis and Sarcocca ruscifolia from 
England, and I'rbinia purpusii from Japan; Hexatylus n. sp. in ginger from China; 
Neotylenchus probably abulbosus in turnip from Wales: Pratylenchus pratensis in 
lily-of-the-valley from Germany, yam from Jamaica, and potato from Mexico: 
Rotylenchvs bradys in yam from Puerto Rico: R. robuslus in soil around roots of 
a century plant from Italy; and Tylenchus filiformis in Arau-aria from Germany. 
COMMON PESTS INTERCEPTED 
Many pests commonlj^ found on their hosts in the United States are intercepted 
more or less frequently. At times such interceptions have indicated the occurrence 
of some of these pests in countries from which they had not been reported. Some 
of these common pests intercepted ma\' represent strains differing markedly in host 
reactions from the ^trains already established here. However, we have no ready 
means of determining the possible importance of common pests intercepted and 
no longer record mo^t of them. It is believed that the interceptions listed in these 
paragraphs are sufficiently representative of this type of material. In addition 
to diseases common in this country, one disease (Elsinoe phaseoh) which occurs 
in Puerto Rico but is not known to occur in the continental United States has 
been intercepted so frequently on lima beans from Cuba that its interception has 
been recorded as though it were a common pest. 
The two sets of figures in parentheses following each pest name indicate the 
number of countries from which the pest was intercepted and the total number 
of interceptions. 
INSECTS 
Acanthoscelides nhtectus (10 — 398), Ahasverus advena (21 — 109), Aonidiella 
aurantii (18 — 85;, Aphis gossypii (15 — 297), A. rximicis (5 — 26), Araecerus fas- 
ciculatus (16 — 24), Aspidiotus camelliae (9 — 20), A. cyanophylli (11 — 47), A. hederae 
(16 — 92), A. lataniae (21 — 169), A. peniiciosus (7 — 14), Aidacaspis pentagona 
(10 — 22), -4. rosae (3 — 3), Brevicoryne brassicae (11 — 38), Carpocapsa pomonella 
(17 — 83), Cathartus quadricollis (4 — 86), Cavariella capreae (6 — 26), Cerataphis 
lataniae (13 — 61), Ceroplastes floridensis (5 — 30), Chionaspis citri (8 — 24), Chry- 
