yh x 
a 
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Summer rainfall Soring population 

Year Deviation Year 
Quantity from __tarvae per square foot 
; average Average Minimum Maximum 
Inches ; 
1926 17.20 +4.97 1927 4.4 O 12 
1927 M52e5 +3.02 1928 7.0 Q 24 
192 15.84 +3.61 1929 9.2 1 38 
1929 7.49 -4.74 1930 29 QO. 19 
1930 10353 -1.70 1931 6.9 Q 36 
1931 viol fe +8451 1942 9.6 0 61 
1932 eget 8.02 1933 4.6 0 33 
The fact that markedly dcficient summer rainfall is followed by 
greatly reduced beetle populations suggests the thought that summer 
drought may serve as an effective influence in limiting Japanese bee- 
tle colonization to those sections of this country in which rainfall 
during the summer normally exceeds 6 inches. 
Control of adult Jup beetle by means of mechanical traps.--A re- 
port on the work at Cape Charies, Va., has been completed by F. W. 
Metzger, who summarizes it as foilows: During the summer of 1933 
trapping for the Japanese beetle at Cape Charles, Vu., was carried on 
by the Japanese bectle laboratory, to obtain further data on the ef-— 
fectiveness of the soil treatments applied in previous years by the 
Bureau of Plant Quarantine. 4A total of 1,796 beetles were captured 
in 1933 in 500 trans, as compared with 1,636 in 1932. Of this number, 
1,178 beetles, or 65.5 »ercent, were captured in the area treated with 
lead:arsenate. In 1932, 1,396, or 85.5 percent, of the total were 
taken in the same area. In 1933, 618 beetles, or 34.5 percent, were 
taken in the untreated area, as against 240, or 14.6 percent, taken in 
I¥52. .A total of 1,650 beetles, or 91.3 percent, of all captured were 
taken in the traps in 1933, the remainder bein caught by hand. No 
beetle injury was visible at Cape Charles, even in the localities 
where it was captured in the largest numbers. The infestation is still 
very localized within the town, since 4.6 percent of the traps captured 
32.8 percent of all the beetles so taken. Despite a diligent search, 
no beetles were found outside the limits cf the town of Cape Charles. 
Control of Jap beetle in turf.--A report submitted by M. R. Os- 
burn covering the experimental work at Swarthmore College, Swarth- * 
more, Pa., reads es follows: In October 1931, or three months follow- 
ing the first application of materials, examinations for the presence 
