-43- 
1 percent of rotenone was required to equal 0.25 percent of rotenone 
with pyrophyllite. The dosage for equal control of the striped cu- 
cumber beetle was approximately 4 to 1 in favor of pyrophyllite.— 
Turner (602). 
mmmmim 
Sprays and dusts of rotenone materials and of calcium arsenate 
were recommended in 1941. In February 1942 a dust containing 0.75 
percent of rotenone was recommended in plaoe of the 1 percent rote- 
none dust.— U. S. Bureau of Entomology and Plant Quarantine (622 ; 
626» p. 6). 
■mm" 
In Massachusetts dusts were applied eleven times in 1940. Cal- 
cium arsenate was the most effective. Cube with talc (0*75 percent 
of rotenone) and rotenone dust (0.8 percent) gave at least 80 per- 
cent reduction of the beetle population on cucumbers, and 90 percent 
on cantaloupes. In 1941 most of the insecticides applied eight times 
gave at least 90 percent control. The most effective ones contained 
rotenone or calcium arsenate. In 1943 rotenone-" copper oxychloride 
sulfate" dusts containing 0.75 and 0.5 percent of rotenone were about 
equally effective against the striped cucumber beetle; the 0.75-per- 
cent rotenone dust gave slightly better protection on cucumbers, and 
the 0.5-peroent dust on melons. The 0.5-percent dust, if available, 
will be satisfactory.— whitcomb (676 , p. 48; 677 , p. 61; 681 , p. 35). 
A mixture of 12 pounds of d err is and 88 pounds of dusting sul- 
fur gave consistently better results than any other combination test- 
ed, but burned melon plants. A mixture of 12 pounds of dorr is and 
88 pounds of talc ranked second in control •— Wi sconsin Agricultural 
Experiment Station. (694) . 
Disonycha xanthomelaena (Dalman), the spinach flea beetle 
Rotenone is effective; nicotine is ineffective.— Mclndoo (383) . 
Rotenone is recommended against this pest.— Maxwell (407 ), and 
Unite and Doolittle (683) . 
Bpitrix oueumer is (Harr.), the potato flea beetle 
In Massachusetts Cubor and derris mixed with bordeaux mixture 
gave the greatest reduction in leaf punctures on potatoes.— Bourne 
(68). 
In Connecticut a cube dust (0.75 percent of rotenone) was more 
effective than a spray of 1 pound of cube (4 percent of rotenone) 
