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The first dust tested 0,75 percent of rotenone and the second only 0.15 per- 
cent of rotenone, yet both gave substantially the same satisfactory res 1 
v/hen used in the field on cabbage worms. The total active ingredients of 
each dust was 2.70 percent of ether extractives. 
Schotte ar.l Gornitz (564) in 19 35 stated that a ground mixture of 2. 
parts of Derris elliptica root, 7.5 parts of sabadilla seed, an! 90 parts 
of talcum proved useful in exterminating many kinds of caterpillars. In- 
stead of the drugs, their effective extracts or the alkaloids recovered 
therefrom may be used by mixing 0.2 percent of rotenone, 0.3 percent of 
veratrine, and 99.5 nercent of kaolin. 
Walker and Anderson ( 4-66 ) in 1935 reported tests to determine the 
tolerance of cabbage seedlings to insecticide dips used for the control of 
aphids and cabbage worms. Cabbage plants were taken from seedbeds, dipped 
for 30 seconds in various insecticidal baths, and planted in the field, 
and the percentage of plants surviving was determined. In a test conducted 
in the spring of 1933, under favorable weather conditions, over 94 percent 
of the plants dipped in Super Agricultural Spray (a derris product) sur- 
vived without injury. In November 1933 tests were made with dips including 
the commercial derris products, Super Agricultural Spray and Pysol, and 
also Red Arrow, which v/as believed to contain some derris in addition to 
pyrethrum. A severe freeze occurred the night following thsse treatments. 
For plants whose tops alone were dipped, the percentages surviving the 
above-mentioned treatments were 43, 29, and 60, respectively. For plants 
whose tops and roots were dipped, the percentages surviving were 6, 5, and 
14. In a repetition of this test in December, under more favorable weather 
conditions, the percentages were 93, 96, and 96 for plants with tops dipped 
and 31, 74, and 95 for plants with tops and roots dipped. In all these 
tests the derris mixtures were used at dilutions strong enough (1:100) to 
control cabbage worms and aphids. 
Brown (52) in 1936 referred to the use of derris dust (0.6 percent 
rotenone) for the control of cabbage worms. Twenty-five to 30 pounds per 
acre applied or.co or twice is usually sufficient. 
The East Mailing Pesearch Station, England ( 107 ), in 1936 reported 
that a proprietary derris powder was used in the routine spr progr.. 
in 1935 against caterpillars on pears (2.5 lb. + 3-1/3 gal. lime sulfur 
per 100 imp. gal.), and for caterpillars on walnuts (2 lb. + 8 lb. bli - 
stone + 36 lb. hydratcd lime). 
Tho Koloniaal Instituut of Amsterdam (239) in 1936 reported that I 
insects, including caterpillars of butterflies and moths, can be deatr 
with the help of derris. 
The Hew York State Agricultural Exporiment Station (3 I 1936 
reported that extensive experiments were conductod in ■ ri " In 
1934 on the control of cabbage worms, whioh wore unusually i r 
caused serious damage on Danish cabbage. Derris dust (0.5 percent ro' - 
none) proved more satisfactory than lead arsoi . .... On 
such crops as broccoli, cauliflower, brusscls sprouts, and * r loose- 
headed cabbage, a derris dust v/as recommended to avoid ars-jnir.nl residues. 
