30 ANNUAL REPORTS OF DEPARTMENT OF AGRICULTURE, 1933 
as compared with 33 Canary Island and 10 fan palms found infested in 1932. 
A total of 7 infested palms was thus found on 4 properties in this valley in 1933, 
as compared with 57 infested palms on 11 properties in 1932. Six new infesta- 
tions were found in 1932, and none in 1933. Careful scouting was carried on in 
233 sections to locate unlisted palms. A number of small date palms, one infested, 
noted above, were discovered. Ninety-five date palms on infested properties 
were dug out and destroyed. 
PHOENIX DISTRICT 
In the Salt River Valley of Arizona, 41,242 palm inspections were made and 1 
infested palm was found on a previously infested property. The palm was dug 
out and destroyed. This is the only infested palm found in Arizona during the 
past 2 years. Scouting for unlisted palms was continued and 41 3% sections 
covered. 
YUMA DISTRICT 
In the city of Yuma and vicinity, 2,376 palm inspections were made and no 
scale found. 
MODIFICATION OF QUARANTINE 
Effective December 1, 1932, the quarantine was amended by removing the 
Phoenicococcus scale (Phoenicococcus marlatti) from consideration, as it was 
found that this insect is not serious commercially. Evidence of freedom from 
the Parlatoria scale now constitutes the basis for issuing Federal permits for the 
shipment or transportation of date palms or date-palm offshoots from the regu- 
lated areas; namely, Imperial County and that part of Riverside County lying 
east of the San Bernardino meridian in California; Yuma, Maricopa, and Pinal 
Counties in Arizona; and Webb County in Texas. 
QUARANTINE ON DOMESTIC NARCISSUS 
During the past year, special attention has been given to increasing the effi- 
ciency of bulb inspection and treatment methods. Under a reorganized plan 
of cooperation with the Bureaus of Plant Industry and Entomology, progress 
was made in the development of the vapor-heat treatment, and on June 26, 
1933, that method was authorized as a basis for narcissus treatment to eliminate 
greater bulb flies. Vapor heat has also been found very effective as an eelworm 
control, and experiments are now being carried on to determine whether it can 
be relied on to eliminate the nematodes entirely, without injuring the bulbs. 
Difficulties in obtaining satisfactory results from the hot-water treatment 
have also been the subject of investigation, and certain modifications in tank 
design and equipment have been devised to increase the agitation of the water 
and thereby bring about a higher eelworm mortality through better heat 
distribution. 
The treatment and inspection instructions issued in June 1932 have been con- 
sistently adopted by the State inspectors carrying out the field and warehouse 
bulb examinations, and this has increased uniformity of action in the different 
bulb-growing areas. A number of conferences were held with growers and inspec- 
tors in nearly all the leading narcissus-producing sections during the year, and 
differences in methods and interpretations were cleared up. Among other 
questions, the problem of handling large blocks of bulbs which show very slight 
and recent eelworm infestations was intensively studied, and instructions have 
been issued specifying the conditions under which parts of some such blocks 
may be certified as free from infestation. 
For the season of 1932 the State nursery inspectors of the various States 
reported to the Bureau the inspection of 302,323,265 narcissus bulbs grown in 
29 States and the District of Columbia. This represents a decrease of 71,942,429 
bulbs under the figures for the previous year. Of the total, 169,815,503 con- 
sisted of Paper White and other polyanthus types of bulbs grown in the Southern 
States, and 132,507,762 consisted of bulbs of the hardy daffodil types grown in 
the North. Of the polyanthus types, 148,736,581 were reported as being certi- 
fied as uninfested and eligible for shipment without treatment, while 2,188,109 
were either fumigated or given the hot-water treatment and certified for ship- 
ment on that basis. Of the daffodil types, 19,629,551 were certified as uninfested, 
and shipment without treatment was authorized, and 84,580,213 were either 
fumigated or given the hot-water treatment, and certified on that basis. 
