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Typhi ocyba froggatti Bak., a canary fly 
Evans (96) in 1938 reported that in Tasmania infestations of the 
canary fly on har.tho rn hedges may be reduced with derris dusts, one 
application being made early in November and a second one, if warranted, 
at the end of January. 
Typhi ocyba pomaria KcAtee, the white apple leaf hopper 
The Idaho Agricultural Experiment Station ( 1 59 ) in its annual 
report for 1932 stated that T. pomaria is an important, pest of the apple 
in southwestern Idaho, Among the materials tested and found to be satis- 
factory was Cubor (pyrethrum and rotenone). Cube extract in oil emulsi- 
fied i:: -water with powdered milk (cube 1:25,000; oil 0.5 percent) killed 
82 percent of the first-brood nymphs. — Turner ( 271 ) in 1932. 
A dust containing 25 parts of derris (3.95 percent rotenone) and 
75 parts of gypsum r.as ineffective in field tests. — Kelsall and Stultz 
(170) in 1937. 
The Massachusetts Agricultural Experiment Station ( 195 ) in 1938 
reported the results of tests made at IValtham to control the white apple 
leafhopper. In laboratory experiments with pyrethrum and cube dust all 
leafhoppers were killed in 24 hours. Experiments at constant temperatures 
showed -a slight but not consistent increase in effectiveness at 80° F., 
but not at 60° or 70°. 
Typhi oc yba rosae (L.), the rose leafhopper 
McDaniel ( 186 ) in 1928 wrote that among the other better- known con- 
tact sprays are Derrisol and some of the pyre thrum extracts. With these, 
as with nicotine, each insect must be hit in order to be killed, (Empoa) 
T. rosae is one of the insects controlled by these contact sprays. 
Cicadellidae (unidentified species) 
Hamilton ( 135 ) in 1933 reported that derris and cube powders have 
a distinct repellent effect and some fumigating effect against leafhoppers. 
The Kentucky Agricultural Experiment Station ( 171 ) in 1934 
reported that in studies with leafhoppers spray combinations containing 
rotenone, pyrethrum, and pine oil were more toxic than nicotine. Nico- 
tine caused nausea among the laborers in two instances, but the combina- 
tions did not. 
Derris was tested against leafhoppers but the infestation was too 
light to permit conclusions to be drawn. — Howard et al. (154) in 1935. 
Garman ( lis ) in 1936 reported that leafhoppers, although present 
in other parts of an apple orchard, ^;ere absent from the derris-sprayed 
olot. 
