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Acetone extracts of the roots of the Texas Tephros ia virginiana 
were highly toxic to this aphid.— Ginsburg and coworkers ( 227 ) . 
The control of aphids on cabbage includes the use of derris and 
cube with summer oil, and pyrethrum and rotenone sprays and dusts. 
—Hut son (303) • 
The standard recommendations in New York include a dust con- 
taining 0.75 to 1 percent of rotenone, or a spray containing 4 pounds 
of derris or cube powder (4 to 5 percent of rotenone) .—Parrot t 
(457). 
In Crimea the toxicity of the introduced species of Tephros la 
was greater when they were dispersed in mineral oils. Extracts ob- 
tained by the hot method were more effective than those by cold ex- 
traction.— Blyumberg (60) • 
In Russia various extracts of Tephros ia were tested against the 
cabbage aphid* Extracts obtained with chloroform, carbon tetra- 
chloride, trichloroethylene, and ethylene dichloride were more toxic 
than those obtained with benzene and benzine. Ethyl alcohol and 
methyl alcohol extracts were the least effective. The toxicity of 
the extracts increased when they were redissolved in kerosene or trans- 
former oil. "When chloroform extracts of T. Candida were dissolved 
in acetone, the percentages of mortality were 6.6, 9.6, and 81.2 for 
the leaves, roots, and stems, respectively, and these results were 
superior to those given by T. species and JT. vogelii .— Bogatova (61) • 
Capitophorus braggii Gill. 
A cube dust (l percent of rotenone) with Vatsol-OS (1 percent) 
and a spray of 4 pounds of cube powder (4 percent of rotenone) with 
1 gallon of light-medium oil emulsion and 100 gallons of water gave 
good control of this aphid on artichoke in California.— Lang e ( 351 ) . 
Eriosoma lanigerum (Hausm.), -the woolly apple aphid 
Sprays of white oil and derris used against a red spider in 
England caused attacks by the woolly aphid to be less severe than 
usual*— Hey (286 ) • 
Cream of Agicide (a rot enone-b earing compound) 1:200, 1 quart 
per tree, gave poor control of the root form of the woolly aphid.— 
Smith (549). 
