~ - 42 - 
mortality of 56 percent; Nicotrol at 1:200 (nicotine 1:10,000), 97.9 
percent; Penethrum at 1:200 (pyrethrins 1:74,800), 80 percent; No. 519 
at 1:200 (rotenone 1:100,000), 96.9 percent. The check mortality was 
23.2 percent. 
Turner (2¥l) in 1952 reported that cube extract dissolved in mineral 
oil and emulsified with sodium oleate deteriorated during the 5 days 
following preparation. Applications made at a dilution of 1:250,000 of 
cube extract against M. rudbe c kiae killed from 42.7 to 91.6 percent. 
Cube extract in mineral oil emulsified with powdered skimmed milk did 
not decompose on 2 weeks' standing, a dilution of cube extract of 
1:300,000 killing from 54.8 to 74.1 percent of the aphids. 
Macrosiphum soiidaginis (F.) 
Turner (271) in 1932 reported that cube extract in oil, emulsified 
with a sulfonate emulsifier, at a dilution of 1:40,000 killed 81.7 per- 
cent of fc. soiidaginis , whereas a solution of nicotine sulfate (40- 
percent nicotine")" at 1:300 killed only 41.2 percent. 
Macro siphuiTi spp . 
Mclndoo and Sievers (188) in 1924 reported numerous tests of cube 
and derris in the form of dusts and alcoholic and aqueous extracts agains 
unidentified aphids designated as Macrosiphum spp. "A" and "C." The 
alcoholic extracts were the most toxic. The smoke from burning derris 
and cube powders was effective against the species "C." 
My zu.s c era si (P.), the black cherry aphid 
The Michigan Agricultural Experiment Station ( 199 ) in 1925 reported 
that derris sprays had given encouraging but not conclusive results 
against the block cherry aphid. 
The Wisconsin Agricultural Experiment Station ( 513 ) in 1926 reported 
that the petal spray is probably the best for cherry aphid control, and 
Derrisol, imported from England, scorned to possess superior qualities; 
and in its annual report for 1927 (314) stated that both Dorrisol and 
nicotine sulfate wore effective at dilutions of 1:800 parts of water. 
They were about equally efficient, but Dorrisol was cheaper, more 
pleasant to apply, and gave better coverage, although it took from 24 to 
43 hours after spraying for aphids to die. 
The same station ( 315 ) in 1929 reported that Dorrisol applied early 
in the season before the cherry leaves unfold gave commercial control of 
the cherry aphid; in 1938 ( 318 ) reported that the black cherry aphids in 
Door County were controlled by various insecticides, including seven 
products containing rotenone; and in 1940 (522) reported that the evidenc 
of the past season was that derris and bordeaux could be used together 
for control of" the black cherry aphid. Good control resulted when Dri- 
Spray, a proprietary derr:s powder, was used at 3-1/4 pounds to 100 
gallons of half- strength bordeaux (made v/p of 1-1/2 pounds of copper 
sulfate and 2 pounds of lime in 50 gallons of water). Dri-Spray also 
