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The American Association of Economic Entomologists , Eastern Branch 
(7), in 1937 published ''Sntona, " a directory of insect-pest, control. Infor- 
mation on the chemistry, stability, and insectioidal uses of derris and 
cube is given and the principal njjanflffacturers of derris and cube products 
are listed. Plant sprays containing 1 pereent of rotencne and 4 percent 
of total acetone extractives of derris root will give good kill of plant 
lice at a dilution of 1 part to 80C parts of -water. This gives a dilution 
of rotencne equal to 0.00125 percent. 
* Bourne and Boyd (18) in 1937 recommended rotenon r s for com- 
bating "^lant lice in the home garden. 
Dibble (79) in l r .38 stated that nicotine sulfate is better b] an 
derris or pyre thrum for killing most plant lice. 
Hamilton (136) in l r '36 reported tests of cube and derris powders 
(4 percent rotencne and 18 to 18 percent total extractives) applied as a 
spray at the rate of 4 pounds per 100 gallons, with the addition cf 4 
pounds of rosin-residue emulsion, "colly aphids (various spool )s of 
Homoptera, Aphiidae) on beech, elm, larch, and white pine tr- s w re not 
satisfactorily .control .led. 
Aphids can be controlled by sprays of derris powder suspended in 
water containing even loss than 0.02 percent of rotencne. — Van dor Vccht 
( 289 ) in 1938, 
Zaaijcr (325) in 1939 referred to Fund u lea suberosa (rotonone 5.4 
percent) as an excellent insecticide for the control of aphids. 
Dibble, of the Dhited States Department of Agriculture's Extension 
Service, in a "Bug Flash" in 1940 reported that rotcnonc (dcrris-cube) 
dusts arc often satisfactory, although aphids still respond best to nico- 
tine sulfate plus hot soapy viator. 
Cercopidae 
A phrop hora permuta ta Uhl., strawberry spittle bu 
Edwards (93) in 1936 recommended powdered derris or cv.be diluted to 
0,5 percent of rotencne with diat.omaceous earth for the control of spittle 
bugs on strawberries in Oregon. An application should be made 18 days 
after the first nymphs appear, and 2 weeks later a second application 
should be made. About 150 pounds of dust n er acre should be usi 
Hyd rated- lime dust containing 2 percent of nicotine is effective but pyre- 
thrum is ineffective, 1 from 30- to 50-percent control. 
! " Lr. 3 3: recommence ust containing 0.5 percent of 
rotcnonc. 
Clastoptera sp,, cranberry spittl ct 
A spray of 5 pounds of derris powder (4 percent rotenone) and 4 
unds of fish-oil soap in 100 ga ] r, led at the rate of 
3 gal] -on June 16, v a poor kill of the nymphs in their. 
