EMULSIONS FOR JAPANESE BEETLE 11 
warm the plants in a room at 70° F. for 48 hours before dipping, and 
to keep the plants at 70° F. for 48 hours after removal from the dip, in 
order to promote the larval mortality. 
TREATMENT OF JAPANESE IRIS 
The roots of Japanese iris (Iris Jcaempferi) are mainly dug in the 
fall, beginning in September, and shipped immediately for planting. 
In September tests were made of the susceptibility of these plants to 
the wormseed-oil emulsion. Twelve plants were immersed for periods 
of 6, 12, 15, 18, and 24 hours, respectively, in a dip containing 1 cubic 
centimeter of ascaridole per 6 liters of water, at a temperature of 70° 
F. (21° C), and the treated plants heeled in or planted in the nursery 
for further observation. Similar tests were made at the same tem- 
perature and for the same periods of immersion, but in a dip of twice 
the strength, i. e., 2 cubic centimeters of ascaridole to 6 liters of water, 
with the same subsequent treatment. Without exception, the plants 
came through the tests unhurt, and began to throw out new roots and 
leaf growth within a few days. The plants apparently withstand 
nearly twice the period of immersion in twice the concentration of 
dip necessary to insure mortality of the larvae present in the roots. 
TREATMENT OF PERENNIAL PHLOX 
In this section plants of perennial phlox are dug in the fall, some 
when in full bloom to fill early orders, and the remainder from that 
time on until the ground freezes. Care is taken in digging to secure 
as much of the root system as possible, since the long roots are severed 
about 3 inches from the stock, cut into 13^-inch pieces, and the 
pieces sown in coldframes. These root cuttings begin to grow early 
in the following spring, and are later set out in the field to produce 
the year's crop. The mature plants, having been trimmed in the 
manner described, are packed in damp moss and placed in cold storage 
at 32° F. until February or early March, when they are removed, 
potted, and placed in the greenhouse and forced slightly for the spring 
trade. 
It is evident that an insecticide employed to kill any larvse present 
in or among the roots of this plant must be absolutely nontoxic to the 
roots, stock, and buds. Tests with wormseed-oil emulsion dip for the 
control of the larvse in phlox roots were accordingly made at all stages 
of the harvesting and storage season. The results, the plants in every 
case being unhurt, indicate that wormseed-oil emulsion is a safe 
material to use as a means of killing any larvae present in phlox 
during the period of harvesting and storing it. 
Plants were dug when in full bloom, and separate lots, each of 
12 plants, immediately dipped, all at a temperature of 70° F., but 
each lot for a specified time and in a dip of specified strength. Four 
lots were dipped for periods of 6, 7, 8, and 9 hours, respectively, in a 
dip containing 1 cubic centimeter of ascaridole to 6 liters of waters, 
and three lots for periods of 6, 7, and 8 hours, respectively, in a dip 
containing twice the proportion of ascaridole. All of these plants 
came through the treatment unhurt. Immediately after dipping 
they were set out in the nursery out of doors, and made a normal 
growth during the subsequent spring and summer, the blooms on the 
treated plants having in many cases a diameter of 6 to 8 inches. 
