- 65 - 
Rotenohe in oil emulsified in water with powdered mil:-: (rotenone 
1:25.000; oil 1,0 percent) killed IOC percent of ' les 
of this species; hut oho check oil did likewise a — Turner (271 ) ir 1S32. 
C he p aes code;/ i Gi 1 1 . 
3 SO, 
The eggs of (Adelges) Chermes on pir.e were not killed by sprayj 
with a suspension of rotenone in water (1:20,000). — Davidson ( 85 , in 19c . 
Derris 
(32) in 19:5 5, 
Hot affected "by derris e — Van dor Lean (178) in 1935. 
Kelsall et al„ (169) in 192-3 reported that derris dust 'had appar- 
ently no effect on Chermes. 
Cicadeilidae 
Erpcasca fabae (Harr. ), potato leafhopper, been leafhoppor 
Do Long (72) in 1925 reported that a commercial derris pro.duct 
diluted 1:250 proved un satisfactory against the potato leafhopper. 
icert and Company,, Ir.c,, New "fori", N. 7., in March 1934 stated 
in advertising literature that derris dust is effective against bean lea: 
hoppers. 
Turner ( 275 ) in 1935 reported that three applications of derris 
dust containing 0,4 .percent of rotenone reduced the injury caused by the 
bean le of hopper. 
The Massachusetts Agricultural Experiment Station (19?) in ]936 
reported that Cubor and JTubatox (C.5 percent rotenone ;, each plus bor- 
deaux 5-5-50, increased the yield of potatoes, because of leafhopper 
control. 
Manschke ( 191 ; in 1937 reported that 54- percent of 1 afhoppers 
on beans wore killed by •■ ■ isting of 2 pounds of derris 
dor (4 percent rotenone) per 100 gallons of r.ater plus about 2 pounds 
(dry basis) of coconut-oil soap, Rotenone pr tions --ere effective, 
ace to the Massachusetts Agricultural Experiment Station ( l9 i 
in 1937, 
Derris dusts have given satisfactory results.— Few Jers ; ;ri- 
cultural Experiment Station ( 207 ) in 1937, 
F, W, Poos, in quarterly reports to the Division of Cereal and 
Forage Insect Investigations, oi the tlureau ;f Intomology ana Plant 
Qv -, states that ir 1036 and 1 5 39 he tested rotenc ~i ill w 
dust for the control of the potato 1 ocr. This dr.st applied three 
