ae 
unusually favorable condition which has never been attained before, 
since Seivs (Seiulus) pomi Parrott has been a more or less troublesome 
pest in the work previously. We attribute this freedom from mites to 
several thorough fumigations with sulphur dioxide, and to care in sel- 
ecting mite-free eggs for infesting the incubator rooms." 
JAPANESE BEETLE AND ASIATIC BEETLE RESEARCH 
Beetle Jarvae remain dormant through March.-~Larvae of the Japan-— 
ese beetle (Ponillia japonica Newm.) "remained in dormant state through-— 
out practically the entire month," according to Henry Fox, Moorestown, 
N. J., who says, "The temperature in general was low and only near the 
end of the month did the soil near the surface become sufficiently warm 
to favor renewal of larval activity. Rainfall was rather excessive. 
* * * As previously noted, indications of an upward movement were found 
in January, but since then a steady decline in the percentage of larvae 
occurring within 1 inch of the surface has been evidenced in the field 
records, with the result that, in March, only a very few were found 
within this distance of the surface." 
Lateral migration of ervbs in soil.--I. M. Hawley, Moorestown, re- 
ports: "Two tests with grubs brought in from the field have been car— 
ried on under conditions that would permit a migration up to 7 feet. 
Two bins, each 8 by 4 feet, filled with about 1 foot of moist compact 
soil were set up in the greenhouse. In each bin 100 grubs were placed 
at a depth of 3 to 5 inches in a trench 1 foot from one end. In the 
last foot in the other end of each bin wheat was planted. It was neces-— 
sary, therefore, for grubs to travel at least 6 feet to reach the wheat, 
and by going through the wheat they could travel a distance of 7 feet. 
The first bin, started on January 30, was examined on March 7, and the 
second bin, started on February 20, was examined on March 28, the time 
covered in each case being 37 days. Of 161 grubs recovered in the 2 
bins, 7 traveled more than 80 inches, 13 more than 70 inches, 20 more 
than 60 inches, 32 more than 50 inches, 50 more than 40 inches, 65 more 
than 30 inches, and 78 more than 20 inches. The others were found nearer 
the starting line or had moved toward the opposite end of the bin only 
1 foot away. It is interesting to note that 6 grubs traveled through 
6 feet of fallow soil and 1 foot of wheat and reached the end of the bin. 
In the first test 43 of 75 recovered were in the top 6 inches of soil, 
while 71 of 86 recovered in the second test were above the 6—inch level." 
(See also February Letter, page 9). 
anese larvae survive flooding.—-W. E. Fleming and F. E. 
Baker, Moorestown, report that “one hundred more larvae have been re— 
moved from Budd's cranberry bog near Pemberton, N. J., where they had 
been submerged for 90 days. They were returned to the laboratory and 
held for observation. The result of the final observation of these 
larvae was as follows: Those submerged 90 days were found to be 48.0 
per cent normal." 
