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JAPANESE BEETLE AND ASIATIC BEETLE RESEARCH 
In the Monthly Letter for August, I. M. Hawley, of Moorestown, 
N. J,, reported that Aserica castanea Arrow had been taken in large 
numbers in geraniol traps at Harrisburg, Pa. Mr. Hawley now writes: 
"To see if this was a real attraction, 9 traps were placed in the heavily 
infested region around Chestnut Hill on August 4. When these were dis-— 
continued on the 16th of September, 40,134 Popillia japonica Newm. had 
been taken and only 269 A. castanea. It would appear that geraniol has 
little, if any, attraction for A. castanea." 
In reporting experiments on the influence of temperature on the 
development of the Japanese beetle, Mr. Hawley states: "Of the series 
of larvae hitherto reported as reared from eggs under conditions approx-— 
imating those likely to be encountered in the extreme Southeastern States, 
the individual reported as having become a pupa on August 31 changed 
about two weeks later to an adult male. On September 1 this entire 
series, which had hitherto been kept in an incubator, was transferred to 
a cellar where temperatures approximating those of late autumn (67-75° 
F.) in the Southern States would be more likely to prevail than in an 
incubator. By September 30 no additional larvae had turned to pupae 
though some appeared to resemble prepupae. The series of larvae reared 
from eggs under out-of-doors conditions showed during the month changes 
parallel to those noted in nature. Most became third—instar larvae. 
The other series of larvae, previously noted as having been reared in: 
an incubator at temperatures averaging slightly above normal, were most— 
ly in the second instar at the beginning of September, but had nearly 
all changed to the third instar before the middle of the month." 
J. L. King, of the Moorestown laboratory, reports the outstanding 
features of the month's work on parasites to be as follows: "In a series 
of experimental tests on the hosts which Prosena siberita Fab. will ac-. 
cept, it has been proved quite conclusively that P. siberita will not 
only accept Aserica castanea larvae as a host, but that when. reared on 
this host two generations of flies are produced; normally with Popillia 
aS a host one generation per year results. Similar tests using the 
native Serica parallela Csy. also gave two generations per year." 
Experiments with eggs in soil treated with lead arsenate were con— 
ducted during the summer to obtain further information on the time row 
quired to eliminate infestation of the Japanese beetle after the egg was 
deposited in the soil, according to W. E. Fleming, in charge of insec— 
ticide investigations at the Moorestown laboratory. "The lead arsenate 
was applied at the rates of 1,000, 1,500, and 2,000 pounds peracre. The 
examinations were made 20, 30, and 40 days after the eggs were placed 
in the soil. * * * In some tests the infestation was eliminated within 
20 days in soil treated at the rate of 1,500 pounds per acre, but 30 
days were necessary to assure destruction of all larvae hatching from 
the eggs. These results are in agreement with those obtained in the 
season of 1929." 
