608 
JOURNAL OF ECONOMIC ENTOMOLOGY 
[Vol. 17 
home of the Japanese Beetle, by experts of the U. S. Bureau of Entomology. It is 
too soon to know just what these parasites will do in this country but much hope is 
held for their permanent establishment. In the insecticide part of the laboratory a 
very interesting development was shown in fractioning oil of sassafras. This oil has 
proved to be decidedly attractive to the Japanese Beetle and has many possibilities 
when used with a poison bait or in spray materials. For the destruction of the grub 
of the beetle the carbon bisulfid emulsion developed at the laboratory is still the most 
dependable and cheapest fumigant. Oil of the American Chenopodium has also been 
used as well as solutions of arsenate of lead. In the protection of the foliage from 
attacks of the Japanese Beetle the development of arsenate of lead coated with an 
insoluble soap seems to be the most effective measure yet tried. The use of flour as 
a sticker at the rate of two pounds to 50 gallons of spray and three pounds of powdered 
arsenate of lead gave very good foliage protection in apple, peach and cherry orchards. 
In connection with the development of attractive oils for the beetles, tests using differ¬ 
ent colors have been tried as an attractive agent. Up to this time red seems to be 
the most attractive color. 
Lunch was served at the clubhouse of the Riverton Country Club, after which 
brief reports were presented by Mr. L. B. Smith and members of the staff at the lab¬ 
oratory, concerning different phases of the Japanese Beetle work. 
The afternoon was spent in visiting different orchards in the infested territory 
and observing results of the remedial measures, and examining a number of experi¬ 
mental areas. 
In the evening the Entomologists met in joint session with members of the Ameri¬ 
can Entomological Society, in the Auditorium of the Academy of Natural Sciences 
in Philadelphia. Dr. P. P. Calvert presided at this session and brief addresses were 
made by Mr. J. M. McKee, Assistant Secretary of Agriculture of Pennsylvania, 
A. F. Burgess, President, American Association of Economic Entomologists, and 
J. L. King of the Japanese Beetle Laboratory, who gave an interesting account of 
his explorations in Japan and Korea. This session was largely attended, the entire 
seating capacity being occupied. 
The following day was occupied in visiting field laboratories and experimental 
plots. At the Bustleton Laboratory of Pennsylvania State College, interesting ex¬ 
periments were observed in the control of wire worms by fumigating the soil through 
the use of calcium cyanide before planting. The experiments were not complete 
but no injury could be noticed in the crop and from preliminary experiments it seems 
that this is a very promising way of clearing the soil of larvae. At the Willow Grove 
laboratory of the U. S. Department of Entomology and the Pennsylvania Bureau of 
Plant Industry, methods of fumigating green-houses were illustrated, in which dust 
of calcium cyanide was the source of the hydrocyanic acid. This method seems to be 
quite promising. The rate at which the cyanide is now used is one ounce of the gran¬ 
ular form to 100 cubic feet for one hour. It may be that this amount will be consider¬ 
ably lessened and that the time of fumigation will be made longer. A brief, but very 
interesting stop was made at Valley Forge during the afternoon. Near West Chester, 
Pa., the orchards in which experiments are now in progress in the use of scalecide 
and sulphur products as carried on by the Crop Protection Institute, were visited. 
The scalecide experiments were not far enough advanced to give definite information 
at present. Several of the colloidal sulphurs and different types of precipitated 
sulphurs have given apple scab control and seem quite promising as spray materials. 
