PA 
iol with kieselguhr failed to affect oviposition, as did the standard 
trap bait when spread on the surface of the ground. A few miscellaneous 
materials, including sulphur, anthracene, potassium ethyl xanthate, o—ni- 
trophenol, kieselguhr, lime, and a-naphthol were dusted on the surfaces 
of sod and fallow ground at the rate of 1,000 pounds per acre. No ma— 
terial had any effect on the oviposition by the beetles." 
Paradichlorobenzene in soil kills ovipositing Japanese beetles.—— 
"Paradichlorobenzene was tested as an oviposition repellent (by F. E. 
Baker) by dusting it on the surface of sod and fallow ground at dosages 
up to 4,000 pounds per acre. in less than 5 hours all of the matermuam 
had dissipated and was of no use in this respect. When this material was 
mixed with fallow ground, it seemed to persist in the soil for a consider-— 
able period of time. When used in this manner it was successful in sreat— 
ly reducing the number of eggs laid in the soil. Reductions of 94.4 per 
cent, 100 per cent, and 99.5 per cent in the egg population after ex-— 
posure to large numbers of beetles for a week were effected with dosages 
of 1,000, 2,000, and 4,000 pounds per acre, respectively. This reduction 
in the number of eggs was not due to any repellency on the part of para— 
dichlorobenzene, because large numbers of beetles were found in the soil 
apparently having been killed by the vapor of the chemical before they 
could lay their eggs." 
Fertilizers do not affect grub insecticides in soil.-—-W. E. Flem— 
ing and F. E. Baker report that "Emergence records of Japanese beetles 
from poisoned field plots (at Moorestown) were completed, as no beetles 
had emerged from any plot over a 10-day period. These records show very 
definitely that this method of determining an infestation is as satis— 
factory as an examination of the soil for larvae, if not more SO, except 
in cases where the infestation at definite times is desired. They also 
show that after 12 months in the soil, fertilizers seem to have no effect 
on the toxicity of acid lead arsenate, di-calcium arsenate, or barium 
fluosilicate to grubs. While acid lead arsenate and di-calcium arsenate 
seem to be just as effective after a 12-month period in the soil, barium 
fluosilicate has greatly deteriorated in value. It would seem that under 
soil conditions this latter material ceases to be of value as an insecti- 
cide after the first season." 
European loosestrife host of Japanese beetle.--R. J. Sim, Moores— 
town, found that "In northern New Jersey, along the Delaware above Tren— 
ton, the beetles were feeding in large numbers on purple loosestrife 
(Lythrum salicaria L.). This introduced European weed was resorted to, 
evidently, subsequent to heavy defoliation of trees and shrubs." 
TRUCK CROP AND GARDEN INSECTS 
Turnip aphid under insectary conditions prefers mustard.—-Norman Al- 
len, Baton Rouge, La., reports that "During August it has been found that 
the turnip aphid (Rhopalosiphum pseudobrassicae Davis) under insectary 
