—15— 
red scale (Chrysomphalus aurantii Mask.) on lemon and Valencia orange 
fruits from adjacent trees in the same grove showed approximately the same 
resistance regardless of host. * * * Inasmuch as it has generally been 
found that orange trees can be kept clean of red scale by the use of low- 
er dosages than are effective on lemon trees, the difference in field re- 
sults probably indicates a difference in the uniformity of stage of devel- 
Opment or rapidity of reproduction between the two hosts." 
JAPANESE BEETLE AND ASIATIC BEETLE RESEARCH 
Treatment of potted plants to kill Japanese beetle.—-J. W. Lipp, 
engaged in control investigations of the Japanese beetle at Moorestown, 
N. J., reports: "Results with paradichlorobenzene indicate that a satis— 
factory larval kill can be obtained by mixing the chemical with soil and 
using the mixture to cover infested pots plunged in clean soil. Naph- 
thalene, when applied under the same conditions, is not so effective as 
paradichlorobenzene. In the tests previously indicated, the soil had a 
tendency to dry out on top. Subsequent tests were run in which the soil 
was wet thoroughly after treating and was kept rather moist throughout 
the duration of the treatments. In these tests it was evident that this 
addition of moisture prolonged slightly the length of time necessary to 
kill with paradichlorobenzene, while with naphthalene no appreciable dif- 
ference was noticed, all the results being unsatisfactory. From all tests 
it is evident that in a heavy meadow soil larvae require a heavier dose of 
paradichlorobenzene (or a longer period of exposure) than that necessary 
to Kill in the clay soils." 
Two species of Ithonidae useless against Scarabaeidae.—-Reporting 
on research work with parasites of scarabaeid beetles at Homebush, Aus-— 
tralia, R. W. Burrell says, "it was found out that the Australian moth- 
lacewing (Ithone fusca Newm.) is entirely coastal in distribution, and 
confined to the sandy country. The species occurring at Eastwood and 
Epping, where the soil is heavier, is Heterithone megacerca Tillyard. 
Fortunately, I had marked the place of origin of all specimens in rec- 
ord series, and sufficient work has been done with individuals from both 
localities so that it is considered that both have had a fair trial and 
are useless against Scarabaeidae." 
TRUCK CROP AND GARDEN INSECTS 
Iris thrips overwinters on its host plant.--Floyd F. Smith, of 
the tropical greenhouse, Washington, D. C., reports: "In connection 
with the trip to western New York (in April), I found the wingless 
Bregmotothrips iridis Watson overwintering as adult females on _ the 
living shoots of Japanese iris at a farm at Hamburg, N. Y. This thrips 
was found on the same plants and on Kniphofia last October." 
