-95- 
jsrs treated with the 0.05, 0.025, and 0.005 percent of DDT. In the 
second test a 3-percent DDT rfust killed all the larvae after the fifth 
week at 30 p.p.m. of DDT. The use of a DDT-oil spray may be the best 
means yet discovered for destroying infestations persisting in wood- 
work. In a third test, the interior walls of some bins were sprayed 
with a refined odorless kerosene containing 6 percent of DDT. A few 
days later the floors of the bins were littered with large numbers of 
dead adults and larvae. In one bin 8,000 dead cadelles were swept from 
the floor at the base of 10 feet of sprayed wall, and the killing action 
persisted for some time.— Cotton et ctl* (120 ) . 
See Sitophilus oryza .— Cartwrlght (108 ) . 
Scarabaeidae 
Autos erica castanea (Arrow), the Asiatic garden beetle 
A single spray of 1 pound of DDT in 100 gallons of water plus % 
pound of Areskap was applied to chrysanthemum plants with a knapsack 
sprayer. The day after spraying, 60 beetles were caged over the 
treated plants. After 2 days a 91 peroent kill of beetles resulted. 
No further injury occurred on the sprayed plants.— II. J. Agr. Expt. 
Sta. (275). 
When DDT was appliea at rates of 20, 30, and 50 pounds per acre 
to infested soil in a nursery the 20-pound-per-scre treatment caused 
a reduction of 99 percent and the heavier dosages 100 percent in larval 
population.— Ha dley and Fleming (196 ) . 
In preliminary tests DDT gave favorable results in the control of 
the grubs.— Baker and Porter (81). 
Cyclooephala boreal is Arrow, an annual white grub 
Same as for ftrfcoserica castanea .—Baker and Porter (81) ♦ 
Macro dactylus subspinosus (F.), the rose chafer 
Grape foliage and clusters were sprayed with DDT (1.5 pounds in 
benzene-kerosene anulsion per 100 gallons of water) on June 5, and 25 
beetles were put in each of 2 cages on June 5, 8, 13, and 17. All the 
beetles were knocked down in less than 24 hours and were dead in less 
than 48 hours.— Baker and Porter (81). 
In the insectary 3-percent DDT dust gave 100 percent control with- 
in 18 hours of beetles placed on dusted foliage up to 4 days after 
treatment. In field tests dusted roses remained free of beetle attack 
but untreated blossoms were destroyed.— Ross (306) . 
