- 45 - 
If the rapidity i action had only boon taken into 
account in the past, & number of valuable insecticides' 
vrould never have come-to ligkfe. There is a startling 
difference betv/een the rapidity of effect of the pyrethrins 
on the one hand and rotenone on the other; for -.Thoroas the 
rapid narcosis produced by the pyrothrins nay vcar off at 
concentrations bclov: a certain level, the narcotic effect 
of rotenone dc opens" "in intensity v/ith time. 
Turner ( 271 ) in 1932 repcrted the results of work carried on during 
1928-31, inclusive, tvith cube extract and vd.th rotononc obtainou from cube, 
Cube extract v.cs incorporated in a sulfonated Tiineral oil called "oil- 
soluble sul fonate" by dissolving the proper amount of cube extract in 
benzol, mixing this rath the oil-soluble sulfonate, and evaporating the 
benzol at lov, r temperature. This preparation at a dilution of 1:200,000 
of total extract of cube killed 37.5 percent cf M. p cr ricae. Five 
months later this prepurath ve the sane percentage of kill, indicating 
no decomposition cf the rotcnone in that time, 
W. DuR, Thornc, American Vice Consul, at Medan, Sumatra, reported in 
1933 that the Deli Experimental. Station buys derris not on a basis of 
rotcnone content but on a basis of other extract to combat M. pcrsic ac 
on tobacco. The concentrated aqueous extract i^ diluted 1:40 for use, 
Garman (117) in 1934 reported that a commercial rotenone preparation 
at 1:1,000 plus bead soap at 1:1,000 gave relatively poor results against 
the green peach aphid. 
Trappmann and ditsche ( 27_0_ ) in 1935 reported 100-percent mortality 
in 4 d-ays of (Phor odon (MyzoderTJ) Myzus .persicae when sprayed v/ith a 
suspension of rotenone Xo.l5-percent rotenone ) plus Turkey-red oil. 
The dosage ". r as r^-.eulated to give a deposit of 0.18 mg. of rotenone per 
500 cm. 
Derris dust failed to give satisfactory control in the field.— 
TBalkor and Andersen (297); also reported by Cory ( 277 ) in 1935. 
Deshpande (77) in 1937 reported that usually tr/o species of aphids, 
Liyzus P^J^jcae and ( Siph o ooryne indobrassicae Das) F ho p-a 1 o s i phum 
psex^dobrassicae (Davis") are found attacking cabbage and that both of them 
go under the common name of cabbage aphid. In 1952 Derrisol at 1:800 
killed 100 percent of the aphids. Derrisol is not no-; manufactured, 
hence is no longei available. 
Dust containing 0.75 percent rotenone may be used to control this 
insect on spinach, cabbage, and cauliflov;er on Long Island. Tt is 
advisable to make the application late in the afternoon or early in 
the evening -.Then do:; is expected. — Crosby, Chupp, and Leiby (_53) in 1939. 
Kau.de (144) in 1939 recommended cube or derris dust (0.75 percent 
rotenone) plus 0.5 to 1 percent of a -/.-otter, to be applied at 30 to 50 
pounds per acre vath a canvas trailer v.hen the plants are dry. 
STATE. 
.^BOABQ 
