110 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
was heavily coated with lead arsenate. Efforts are being made to in¬ 
corporate an attractive material in sprays in such a manner that the 
odor is given off slowly and for a considerable period of time. 
A practical means was devised during the past season for the destruc¬ 
tion and control of the larvae in lawns and golf courses. 1 This consists 
of emulsifying 1 part of rosin-fish-oil soap, 3 parts of water and 10 parts 
of carbon disulfide as a stock solution. One quart of this emulsion is 
stirred into 50 gallons of water and the resulting mixture is applied to 
the infested turf at the rate of 3 pints per square foot. 
Extensive studies are being conducted for the purpose of finding 
means of destroying the larvae in soil surrounding the roots of living 
plants. Three years’ experimental work has resulted in perfecting oil of 
wormseed and carbon disulfide dips for use in treating iris, perennial 
phlox, sedum, peonies, funkia, perennial grasses and similar plants. 
Various methods are being studied for the purpose of devising a means of 
destroying grubs when they occur in the soil ball surrounding the roots of 
coniferous nursery stock. The results thus far secured indicate that by 
adapting the methods and materials which are used to destroy the 
grubs in the roots of other types of nursery stock we will be able to 
obtain their control when they occur in the soil ball. 
From experiments on the control of the larvae by cultural practice it 
was found that between 40 and 50 per cent of the larvae occurring in sod 
land can be destroyed by late fall and early spring plowing and culti¬ 
vation. 
Control by Means of Natural Enemies 
During the past year large shipments of parasites have been received 
from Japan. Several thousand Tachinids (Centeter cinerea Aid.) were 
released this summer and beetles with fertile eggs of the parasite were 
collected in abundance near the point of releasement of the parasites. 
Some beetles, parasitized by this species, were found at a distance of 
l—}4 miles from the locality where the flies were released. In addition 
to the Tachinids, shipments of Dexiids (Prosena siberita Fabr.) and a 
species of Tiphia were also received from Japan and released in the 
vicinity of Riverton. The Dexiid deposits living larvae on the soil. 
These burrow into the ground until they come in contact with the 
Popillia grub, which they parasitize and eventually destroy. 
Studies have been conducted on various native insects which are 
predaceous or parasitic on Popillia , and it was found that the larvae 
1 Bulletin of the Green Section, U. S. Golf Association, Vol. Ill, No. 10. Wash. 
D.C., Oct. 22, 1,923. 
