1 
- 56 - 
Dusts containing 0.75 percent rotenonc are satisfactory. — Haude 
(145) in. 1559. 
(1 C 
Aphids (it ses 
Van d^r Scheer (25 1 .;) in 1935 reported that rotenone-benzene emulsion 
gm. rotenone, 20 cc, benzene, and 55 cc, water containing 0.1 to 0.15 gm. 
] gepon T) at 
leaf aphid. 
concentration of 1:5,000 gave good control of the sesame 
Aphids or soybean 
Miller ( 201 ) in 1935 tried aphids on soybean as test insects in 
determining bhe insecticidal vali 3 : f various species of Derris but tbey 
proved too susceptible a ! ;, to handle; mortality was 100 percent 
in each test, not only wit] the insecticide but also with the control fluid, 
Aphids en spirea 
00 
1:1,2 
The Ohio Agricultural /.vperiment Station (216) in 1922 reported that 
roent of trie aphids en Spirea vanhouttei were killed by Derrisene at 
Aphids on strawberry 
Brooks*, Watson, anr? Mowry (30) in 1932 reported that derris prepara- 
tions may be used iristead of nicotTne sulfate for spraying aphids attacking 
the abowe-grourid parts of strawberry plants. * 
Aphids on tobacco 
Westerman (503) in 1901 recomm ended a solution of derris root as 
a spray 1'oy^ use against lice on tobacco on the east coast of Sumatra. 
Eollrung (145) in 1523 wrote that in Sumatra the following prepara- 
tion had given good results against leaf lice on tobacco: 1-1/2 kg. of 
fresh tuba root mashed in 20 liters of water and diluted with an equal 
volume of water for use. 
Fulnek (109, 110) in 1924, in discussing insecticides for use against 
tobacco pests in Sumatra, listed akar tuba (derris) as a contact insecticide. 
The addition of 0.3 to 0.5 percent of soar to solutions of derris is advised, 
and akar tuba is re,coi:miended for leaf lice on tobacco at the rate of 1 kg, 
in 100 liters of water to which 0.5 kg. of soap is added. Fulmek ( 113 ) - n 
1925 gave directions for spraying against leaf lice with derris. The 
formula is 1 kg, of akar tuba (derris), 100 liters of water, and 300 gm, 
of soap. In 1927 Fulmek ( 112 ) reported the use of a 1-percent water extract 
of the roots of Derris elliptica for the control of plant lice on tobacco 
in Sumatra, 
Bourcart (17) in his book, "Insecticides, Fungicides, and Weed KillersJ 
stated that a spray containing 1 pound of derris, 10 imperial rallcns of water, 
and 5 ounces of soft soap is effective against aphids infesting tobacco in 
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