h- €A's. 
and a little injury to the foliage. Barium fluosilicate and cryolite, 
on the other hand, caused no injury of consequence. Dusting with lead 
arsenate, aS in previous years, was found much less effective than apply- 
ing the material as a spray. 
JAPANESE BEETLE AND ASIATIC BEETLE RESEARCH 
New host plants of Japanese beetle.--Henry Fox, Moorestown, N. J., 
reports that the Japanese beetle had added several food plants in the 
Pine Barrens to its list. "In addition to feeding voraciously upon the 
bracken and cinnamon fern, it now defoliates shining sumac (Rhus copal— 
lina) and the tough-leaved scrub oak (Quercus ilicifolia). Numerous 
other plants characteristic of the Pine Barrens are fed upon also. Fre- 
quent grassy areas and margins furnish proper conditions for the devel- 
opment of larvae throughout the pine region." He reports also that his 
pelief that the northern bayberry, Myrica carolinensis, may be attacked by 
the Japanese beetle is based on damage rather than on actual observation 
of feeding. 
Japanese lettuce and not "dwarf dandelion" attractive to Japanese= 
beetle grubs.-—-In the June Monthly Letter it was noted that grubs were 
unusually numerous around dwarf dandelion (Adopogon carolinianum). "The 
determination of this plant," reports I. M. Hawley, "was made by mem— 
bers of the laboratory staff but later, as there was some question as to 
the correctness of this identification, specimens were turned over to 
botanists of the Academy of Natural Sciences in Philadelphia. They re— 
port that it is apparently Lactuca stolonifera, a plant native to Japan.” 
Repellency of paradichlorobenzene to oviposition of Japanese bee— 
tles.--J. W. Lipp, Moorestown, reports that "When the chemical was plac— 
ed on the surface of the soil no ovipositional repellency was noted if 
the pots were in the sunlight, possibly because the material evaporated 
so readily. If the pots were in the shade fewer eggs were found in 
treated than in untreated pots. When cages of beetles were placed over 
soil containing paradichlorobenzene at the rate of 10 pounds per cubic 
yard, no eggs were found. * * * In outdoor tests beetles confined in 
cages (3 feet by 3 feet) were given opportunity to oviposit in both 
treated and untreated soil. In one series, 4-inch pots were plunged in 
untreated soil; half were covered with untreated soil, the other half 
with soil containing paradichlorobenzene (10 pounds per cubic yard). 
One-half cubic foot of this mixture was sufficient to cover 56 pots, or 
about 1 square yard of surface, which was equivalent to a dosage of ap— 
proximately 3 ounces of chemical per square yard of surface. No eggs 
were found in the pots covered with treated soil, whereas the pots covered 
with untreated soil averaged about 35 eggs per pot at the end of 3 days. 
Many dead beetles were found in the treated pots." 
Rotenone inefficient as an ins de against the Japanese beetle. 
i ide a 
--—M. R. Osburn, Moorestown, sa t and stomach poison tests with 
Suspensions of rotenone as con centered as l-to-200 show very poor re- 
sults in killing the adult Japanese beetle." 
