
a er 
in August, bringing the total number of species recorded to 46. Of these, 
58 species are now definitely known to be parasitic on some stage of the 
Oriental fruit moth, the remaining 8 species being doubtful rearings, 
although each was suspected of having been parasitic on the oriental 
fruit moth. He also reports 3 species of predators of this pest. 
JAPANESE BEETLE AND ASIATIC BEETLE RESEARCH 
Paradichlorobenzene fatal to Jap-beetle grubs in plunged pots.-—- 
"In a series of mortality tests," J. W. Lipp, Moorestown, N. J., reports 
that "4-inch pots were infested with five Japanese beetle larvae each 
and plunged in untreated soil outdoors. Seven tests were run, each in- 
vOlving 64 pots (1 square yard). The first five treatments were at the 
rates of 1,000, 1,500, 2,000, 2,500, and 3,000 pounds per acre, the poison 
being mixed first with soil, 1/2 cubic foot being used to cover a square 
yard. The remaining two treatments were at the rates of 1,000 and 1,500 
pounds per acre, the required quantity of poison being scattered directly 
on the surface of the pots and then covered with soil. * * * From the 
results obtained, it would seem that from the standpoint of larval mor- 
tality 1,500 pounds per acre is the minimum guantity which should be used 
and the chemical should be mixed with soil before applying. The soil 
seems to supply bulk and permit a more even distribution of the chemical 
over the area to be treated. It was apparent during the course of the 
treatments that it is easy to apply the paradichlorobenzene unevenly and 
so produce a condition where some pots do not receive enough to produce 
a complete kill." 
Coated lead arsenate not a safe spray for grubs in grass.--M. R. 
Osburn reports that "On September 22, an experiment was conducted on a 
portion of the lawn at the Moorestown laboratory to determine the ad- 
visability of substituting oleate-coated lead arsenate for powdered lead 
arsenate in a spray to control Japanese beetle larvae. One plot of grass 
was sprayed with a suspension of powdered lead arsenate at the rate of 25 
pounds of lead arsenate in <9 gallons of water to 1,000 square feet. 
A second plot of grass was sprayed with a suspension of oleate-—coated 
lead arsenate at the rate of 58 pounds of coated lead arsenate (equal 
to 25 pounds powdered arsenate) in 29 gallons of water to 1,000 square 
feet. One half of each of these two plots was washed. with water imme- 
diately after the application. The two remaining halves were left un- 
washed. On September 29, or one week later, the block sprayed with 
coated lead arsenate and left unwashed showed severe injury to the blades 
of grass. The block sprayed with the powdered lead arsenate and left un- 
washed was injured, but less severely than the coated lead arsenate plot. 
The injury to the two washed plots was slight, although noticeable. Itis 
believed that the oleate-coated lead arsenate might be substituted for 
the powdered lead arsenate without severe injury to turf if care is ta- 
ken to wash the grass thoroughly immediately after application." 
