
a 
Survival of fruit-—fly larvae in ocean.—Concerning the advisability 
of dumping waste or rotten fruits infested with the Mediterranean fruit 
fly into the ocean for destruction of the fly larvae, R. H. Marlowe 
and Tai Hee Hong, Honolulu, T. H., have observed that "In four experi- 
ments with infested kamani nuts and two experiments with infested Medi- 
terranean sweet orange, the fruits after floating 48 hours in sea water 
will yield larvae, while 72 hours was necessary for 100 per cent kill; 
in one experiment with infested calamondin orange, two experiments $ith 
infested tangerine, and two experiments with infested sc ir orange, it was 
found that after 48 hours in sea water no larvae emerged from the fruits; 
in the one experiment with infested guava, 24 hours in sea water sii 
complete mortality. In every case where larvae came from fruits, a cer— 
tain per cent of adults would emerge. More data are being collected in 
regard to other host fruits." 
JAPANESE BEETLE AND ASIATIC BEETLE RESEARCH 
Beetle population increasing.-Henry Fox, Moorestown, N. J., has 
compiled and summarized data on the number of adult Japanese beetles 
caught in a series of bait traps operated in the same places in the vicin— 
ity of Moorestown and Riverton since 1926 and reports: "The results in- 
dicate the beetle population of 1931 in the oldest infested area in the 
vicinity of Riverton and Moorestown as definitely greater than that of 
1930--a result in conformity with conclusions drawn from data based upon 
a quantitative survey of the soil-inhabiting stages." On the relation 
of rainfall to beetle abundance, Mr. Fox notes that "the lowest catch 
was in 1930, the next lowest in 193l--results which might have been in- 
ferred from the data yielded by the larval surveys." 
Work with Tiphia vernalis Roh.-J. W. Balock, Moorestown, summari- 
zes the biological studies on this Japanese beetle parasite for the past 
year as follows: "Two shipments of females were received, totaling 
5,718, of which 5,259 (91.9 per cent) were alive on arrival. Eleven 
“colonies were started from this material, making the total number of 
colonies liberated to date 30. Fourteen out of the 19 colonies in the 
field prior to 1931 were scouted and 6 colonies were recovered. The 
colony showing the most promise was the one at Philmont, Pa. At this 
colony on May 18, 142 females were attracted and caught by using a 10 
per cent honey-and-—water solution over a period of 3 hours, from 10.30 
a.m. to 1.30 p.m. * * * " He also states that "An experiment to de-— 
termine whether T. yernalis is attracted to its host indicated that the 
females locate host grubs largely by chance, as the attraction of the 
host grub to the Tiphia is slight, if present at all." 
Native Tiphia put to work.—M. H. Brunson, Moorestown, reports: 
"Twenty-four native females of Tiphia were collected and used in an 
attempt to ascertain if the native Tiphia common in the field during 
August would oviposit on Japanese beetle grubs and if the parasitized 
grubs would form cocoons, et cetera. Practically all of the Tiphia 
oviposited on the grubs. All eggs were placed on the dorsum From the 
many parasitized grubs only one cocoon was obtained " 
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