3. 
In another test, 2$-inch pot bags were packed with poisoned 
soil 4 inch deep between and over them. With expesures of 1 day or 
longer with 2 pounds of paradichlorobenzene per cubic yard, and of 
& or more days with 1 pound of paradichlorobenzene per cubic yard, 
complete kills were obtained. 
Injury to plants by lead arsenate used to control Jap beetle 
larvae.--Tests have been continued by F. E. Baker, Moorestown, to 
determine the effect of acid lead arsenate in the soil on the germin- 
ation and early development of various vegetable seeds. Lettuce 
failed to germinate, even in untreated soil, and has, consequently, 
been started again. In addition, lima beans, string beans, and beets 
have been planted in soil impregnated with acid lead arsenate. Pre- 
liminary indications are that, although the seeds of most vegetables 
germinate normally, the early growth of the plants is stunted in most 
cases. To date this seems to be true of sweet corn (Golden Bantan), 
turnips, carrots, peas, pop corn, and radishes. 
Effect of fungus on parasite cocoons.--T. R. Gardner, Moores- 
town, reports that cocoons of Tiphia popilliavora Roh. (Korean strain) 
‘being overwintered in the cool cellar when examined showed that 3.3 
percent of the cocoons had to be discarded owing to the presence of 
external fungus. It is of interest to note that most of the fungused 
cocoons came from the first cocoons spun in the fall. Dissection of 
these cocoons showed that all of the parasites had died in the larval 
stage. The 268 Popillia japonica grubs that had been parasitized 
With T. popilliavora (Korean strain) last fall, but which had sur- 
vived parasitization and were still alive, were examined. These 
grubs showed that the parasite had died in the following stages: 204 
in the egg and first larval stage, 13 in the second larval stage, 6 
in the third larval stage, 6 in the fourth larval stage, and 3 in 
- the fifth larval stage. In 36 grubs it was impossible to determine 
what stage the parasite had died, as no eggs or larval skins were 
present on the srub and the host derm was so blackened that no feed- 
ing punctures could be discerned. This examination as evidenced by 
these host. grubs shows that. approximately 80 percent of the mortality 
in this laboratory breeding work occurred in the egg and first lar- 
val stage. We may assume that most of this mortality is caused by 
the rubbing off and the crushing of eggs and delicate first-stage 
larvae in transferring and moving the grubs. 


J. W. Balock reports on the condition of Tiphia vernalis cocoons 
received last September. These cocoons have been kept in storage in 
the refrigeration cellar. At the last examination, 1,249 cocoons 
were discarded because of fungus disease, bringing the total loss of 
this shipment to date from fungus to about 25 percent. 
