- 3 - 
other half of the plant was dipped for a similar length of time in a 1- 
percent mixture of 30 percent of Pyrolene M. F. (a sodium salt of a syn- 
thetic wax prepared from a vegetable base)., and 20 percent of the derris 
extract described above. 
a few 
■ol ant- 
few 
we 
lea* 
res 
are 
al 
and 
20 
5 & 
i . 
contro 
fcions 
Both treatments gave 100-percent control of all stages, except for 
adult vhiteflies that escaped before the plant was submerged. The 
suffered no apparent ill effects from the treatments and within a 
eks the dead bodies and cast skins of the whiteflies came off the 
, and the plant was restored to a normal thrifty condition. Test- 
so recorded with Stantex R (80 percent of Stantex Dispersing Oil 
percent of derris extract in camphor- sassafras base oil containing 
of rotenone per 100 cc). The citrus whitefly was satisfactorily 
lied on gardenias by thoroughly- spraying with 1- and 2-percent solu- 
of Stantex R .emulsified with soao. 
Trial euro des vaporariorum (Westw. ) f the greenhouse whitefly 
Davidson (6^, 6U) in 1930 ma.de careful tests in a greenhouse with 
pure rotenone, racem-ic deguelin, tephrosin, and toxicarol. These were 
suspended in water by adding an acetone solution of each to water without 
the addition of a wetter or spreader. Results were as follows! 
Insecticide 
Concentration 
(sm. 
cc. ) 
Mortality o f whitefly stages 
Eggs . : Larvae : Pupae 
Rotenone ------- 1 
Do . 1 
Do-" 1 
Do 1 
Do 1 
Do 1 
Racemic deguelin - - - 1 
Tephrosin ------ i 
Toxicarol ------ l 
Percent 
Percent 
2-50 
— 
— 
2,000 
99-1 
— 
20., 000 
82.0 
— 
30,000 
— 
9^.9 
60,000 
— 
88.8 
100,000 
9.6 
9-^.7 
30,000 
— 
23.O 
20,000 
lU.o 
— 
500 
25.0 
— 
Pe rcent 

Tiburec and Slattny (268) in 1939 reported that in experiments 
with the greenhouse whitefly all the adults were dead in 30 to 38 minutes 
after being dusted with a powder of derri? and pyrethrum mixed with chloro- 
picrinat the rate of 3 cc. r>er 1000 grams. The whiteflies became very 
active before they died, which indicated that chloropicrin itself does 
not posses'; any particular insect icidal property but, by accelerating the 
metabolic processes in the insects, renders them more susceptible to the 
toxic effects of other substances. 
Aleyrodidae (unidentified species) 
Davis (66) in l n 32 stated that with penetrating miscible oils 
derri*-- has proved very effective against whiteflies. 
