-74- 
In tests with this aphid on turnips the medium lethal dose of 
cube-talo dust appeared to be decreased by the addition of con- 
ditioning agents.— Howard and Apple ( 293) . 
A derris suspension containing 0,02 percent of rotenone used 
as a spray or dip gave good control of this aphid on tobacco in 
seed beds in Java. The seedlings were immersed up to the roots in 
bundles of 50 to 100 when they were transplanted.— Schweizer (531, 
p. 41; 532 , p. 25). 
In New South Yfeles this aphid on cabbage may be controlled by 
the use of derris dust throughout the sea son .--New South Wales De- 
partmait of Agriculture ( 443 ) • 
Rotenone is more effective than nicotine for the green peach 
aphid on potatoes, peppers, and spinach. — U. S« Bureau of Entomology 
and Plant Quarantine (628) . 
A spray containing 0.2 percent of derris powder (10 percent of 
rotenone) and 0.1 percent of soap gave the best control in Sumatra 
and freed from infestation 97 percent of 3,510 tobacco leases in 
one series, and 99 percent of 2,898 leaves in another «--Laan (349 ) . 
In preliminary tests in Virginia a derris-L ethane 384 dust was 
not effective in controlling the spinach aphid. Black Leaf 155 
was not so effective as derris dust in controlling larvae of the dia- 
mond-back moth but was more effective in controlling Myzus persicae 
on collards. A combination of the nicotine and derris tended to be 
more effective than the niootine alone in controlling the aphids, 
and more effective than the derris alone in controlling the larvae 
of the moth. Also the hydrated lime tended to be a better diluent 
for the derris-Black Leaf 155 mixture than pyrophyllite when used 
within 8 days after being mixed. Derris-pyrethrum dust gave good 
control of the moth, but did not give satisfactory oontrol of the 
aphids. Several growers used Black Leaf 10-derris dusts and Black 
Leaf 165-derris dusts for "the oontrol of aphids and the larvae of 
the diamondback moth on their kale and oollards with very satisfac- 
tory results .--.Talker and Anderson ( 647 , 650 ) . 
( Myzus ) Capitophorus rosarum (Kalt.) 
Acetone extracts of the roots of Tephrosia virginiana from 
Texas were highly toxic to this aphid.— Ginsburg and coworkers (227 ) • 
Pemphigus sp., a poinsettia root aphid 
Cube powder did not kill more than half of those treated. The 
