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pyrophyllite or cheap flour at the rate of 1 part of derris to 4 parts 
of diluent.— Smith (665), 
(Argyroploce ) Badebecia urticana (Hbn.) 
Derris dust, if applied promptly, was effective against this in- 
sect on strawberries in England.-- Massee ( 398 ) . 
Carpooapsa poaonella (L.), the codling moth 
In laboratory tests a dust containing 0,1 percent of pyrethrins, 
applied to adult moths, killed 91 percent in 6 hours, while a cube 
dust containing 0.96 percent of rotenone and 4.3 percent of ether ex- 
tractive killed only 19 percent. When mature larvae were dusted with 
pyrethrum (0.2 percent of pyreth..'ins), 100 percent died in 24 hours, 
but the cube dust killed only 71 percent.— Gnadinger and coworkers 
(233). 
In Washington the substitution of 1 pound of 4-percent rotenone- 
bearing material for 1 pound of lead arsenate failed to show better 
control than lead arsenate at 3 pounds per 100 gallons,— Webster and 
0»Neill (666). 
A lead arsenate schedule, in which nicotine bentonite was re- 
placed by a spray of rotenone powder and derris extract, gave excel- 
lent results on two varieties of apple, but was not effective on the 
third.— New Mexico Agricultural Experiment Station ( 438 ) . 
An orchard of several thousand trees was sprayed with a mixture 
of lead arsenate and IV-X (a proprietary product containing rotenone 
and pyrethrum) • The crop was from 95 to 98 percent free of codling 
moth larvae. On the cheok block, where the straight lead arsenate 
schedule was followed, only 50 to 75 peroent of the fruit was clean. 
—Pratt (474) . 
Previous attempts to use rotenone against the codling moth 
wore unsuccessful, bat in tests begun in 1938 in New York sprays made 
with rotenone-bearing roots gave promising results and, with the ad- 
dition of a spreader and adhesive, were more effective than sprays 
of nicotine or lead arsenate. Rotenone extracts were inferior to the 
powdered root. In 1958 cube (4 percent of rotenone), applied to 
apple trees at 4 pounds per 100 gallons, gave only 54 percent control. 
A rotenone extract gave 76 peroent control, but powdered derris (5 
peroent of rotenone) used at 5 pounds per 100 gallons in 1 quart of 
summer oil gave 82.5 percent. In 1941 2.5 pounds of powdered derris 
