- 2 - 
I.7TR0DUCTI01T 
This is the third in a series of papers designee 1 , to review all avail- 
able information on the insecticidal uses of rotenone and the rotenoids. 
Part I reviewed tests with Derris , cube, timbo, Tephrosia , Mundulea , and 
their constituents on members of the orders Collembola, Orthoptera, Derma'n- 
tera, Odona.ta, Isoptera, Corrodentia, and Mallophaga. Appa.rer.tly no tests 
with the rotenone plants on Thysanura, Ephemerootera, or Plecoptera have 
been recorded. Part II reviewed the tests made on Thysanopter? . Part III, 
the present paper, rpviews the tests on Homoptera. 
HOMOPTERA 
Aleyrodidae 
Di al euro des chittendoni Laing, a rhododendron whitefly 
••'ilson (709) in 1929 reported that sprays containing nicotine and 
derris were found to be les^ toxic than a 2-percent oil snray to nymphs 
of this whitefly infesting leaves of Rhododendron jacksoni and R. -ponticum 
in England. 
Dialeurodes citri (Ashm.), the citrus i^hitefly 
Cnbe extract in oil, emulsified in water with oowdered milk ( CT.be 
extract 1:75,000, oil 0.33 percent), killed 97«^+ percent of the larvae, 
as compared with 79-9 percent killed by the check oil; of the eggs 23.6 
percent «ere killed ~oy cube extr-ct in oil (cube extract 1:^0,000, oil 
0.5 percent), r s compared with 10. 5 percent by the check oil. — Turner 
(271) in 1932. 
The Alabana Polytechnic Institute (~) in 193'S reported on the ef- 
fectiveness of derris Powder with' various carriers against the citrus 
whitefly. Ir "x~eriments with -•■owdered derris added to soaps, sulfated 
alcohols, sulfonated castor oil, sodium s c alts of alkylated aryl compounds, 
oil emulsions, and other materials, the dilute oil emulsions (0»5 and 1.0 
■oercent) formed more effective combinations with derris than the more 
specific wetting agents. The effectiveness of derris was depressed in 
both acid and alkaline wetting media, and in liouid lime sulfur. With 
soap, derris was more effective than nicotine sulfate and organic thio- 
cyanate sprays. 
Anderson and Walker (£)_in 1939 reported on the control of white- 
flies on gardenias. Immature stages of the citrus whitefly on a tropical 
hibisOT.s plant ir. an 8-inch flowerpot in the Virginia Truck Experiment 
St-Mon greenhouse were not controlled by dins of nicotine sulfate plus 
soap or Lct^ane UUo. When the leaves of this hibiscus plant were heavily 
infected "ith all stages of the vhitefly and some of the leaves were 
turning yellow, one-half of the plant was dipped for 30 seconds in a 
solution containing 1 percent of a 60 percent St-^ntex Dispersing Oil (a 
mineral oil containing a small percentage of oleic acid and a certain 
slender) and Uo percent of a derris extract in camphor-sassafra,s base 
oil containing 5 £?n. of rotenone in 100 cc. , 1 nercent of liquid Red "A" 
Soap (containing Uo percent of dry soap) and 95 percent of water. The 
