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JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
blue berries, hydrangeas, ferns and other similar potted plants during the 
next growing season. A detailed report of this phase of the work is now 
in preparation and will be submitted for publication in the near future. 
The same general scheme has been followed experimentally in the 
treatment of evergreen nursery stock such as boxwood, pine, spruce, 
hemlock, arborvitae, retinispora, yew, etc. The work has been done 
under nursery conditions and the results indicate that the method will 
have considerable application in the treatment of this type of nursery 
stock as grown in the infested area. The aerial portion of the plant is un¬ 
injured and the feeding roots are rapidly replaced. Early and late fall 
treatments have been made and will be continued during the next 
spring and summer. 
As indicated above, the methods evolved all necessitate the treat¬ 
ment of the plant by pouring the toxic liquid on the surface of the soil 
and allowing it to percolate thru the soil mass, the plants being either in 
pots or growing in the field. Considerable experimental work 3 has been 
done in respect to digging infested plants, wrapping them in burlap, and 
dipping them in the toxic solutions. The experimental results indicate 
that the soil absorption and possibly some other soil phenomena inter¬ 
fere with the action of the toxic material under these conditions. Con¬ 
siderable work is now being done along these lines. 
While the experimental work to date involving the dipping of large 
balls of soil has been negative in character, it has been found that the 
dipping method has a considerable application in the treatment of 
matted and hollow rooted plants such as phlox, iris, and peony where only 
small amounts of soil are present. In this connection the carbon bi¬ 
sulphide emulsion dip has been applied to the treatment of peonies and 
American wormseed oil emulsion dip to the treatment of Japanese iris, 
phlox, hemerocalis, sedum, etc. During the past two years, the writers 
have treated 75,000 plants of this nature grown by two local nurseries 
and valued at $25,000. In view of the fact that large acreages of these 
types of plants are grown in this immediate vicinity, it is very probable 
that this method will have a large application. The results of this phase 
of the experimental work have been submitted to the Department for 
publication. 
Aside from these phases of the work involving the treatment of 
nursery stock, the problem has arisen of controlling the larva in lawns 
and golf courses where it is frequently present in such large numbers 
Teach, B. R. and Thompson, J. W. Soil treatment to control the Japanese 
beetle larvae about the roots of coniferous plants. In Soil Sci. 12, 43-59. 
