70 
Material 
Av?.rag? 
kill cf- - 
liar vat? 
" '"Adults 
Percent 
Pt^rcent 
U7.2 
'51a 
32. S 
Ul.g 
25.6 
Us. 7 
2U.g 
22.2 
uc.s 
U7.6 
32.0 
33.8 
30. u 
22.7 
Dusts: 
Derris-talc (0.75 percent rot -none) 
Cu"be -r- talc (0.75 percent rotenono) 
Derris-totacco (0.75 percent rotenone) 
Cute-tolDacco (0.75 percent rotenone)' 
Derox 
CulDor dust 
KulDatox dust 
Sprays: 
Berris (3.5 lb. per 100 gal.) IS.U 20.5 
Cute (3.5 It, per 100 gal.) 2.U IQ.O 
Cul)or spray (2 iJ). per 100 gal.) U. g IJjJ^ . 
Turner (J77) in 1935 reported that one applic-ition of derris ^ 
dust containing 0.6 percent of rotenono^ or pyrcthrum dust contain- 
ing 50 percent of pyrethrum, controlled a light infei'tation of "bean 
beetles. Three aiDplications of derris dust containing O.U percent 
of rotenone, or pyrethrum dust containing 25 percent of pyrt^thrum, 
controlled a moderate infestation of "becin beetles and also reduced 
the injury cpused by the bean leafhopper ( Empoasc^ fabae (Harr.), 
Both of thesp dusts controlled bean beetles as efficiently as did 
tvro sprays of magnesium a.rsenate at th-- rate of ^ pov.nds in 100 
gallons of watrr. Bordeaux mixture (U-U- 50) applied to lima beans 
three tinies during the sea,son was slightly lese effective in control- 
ling bean beetles than copper-lime-calbium arsenate dust applied once 
and follovred by two applici^ticns of derris dust containing 0,6 per- 
cent of rotenone. 
Turnr-r and Friend ( 379 ) i-^ 1935 reporte''. results of tests for 
the control of the Mexican bean beetle in Connecticut. Derris dusts 
containing 0,h and 0.6 percent of rotenone , and pyrethrum dust con- 
taining 25 percent and 50 percent of pyrethrum flow-rs, were used in 
I93U. The 25~pe'rcent pyrethrum dust was less effective than the derris 
dust containing O.U percent of rotenone. All these dust applic^'tions 
vrere very effecti'-'e in producing a high percentage of ■ uriinjurcd pods. 
Use of derris and pyrethrum sprays following magnesium arsenate applic- 
atif^ns invariably caused foliage injury, prob'^bly due to the action of 
sos.p spreaders on the arsenical rf^sidue, S^ch sprays cannot be used 
with safety on vines previotisly sprayed with arsenicel compounds. 
Derris and pyrothrixm dusts caused no foliaii^e injury in any te^st. 
The United States Department of Agriculture, Burer-u cf Entomology 
and Plant Quarantine (^S^.) in 1935 if;sur>d chan^^-es and additions in the 
recommendations for the control of the Mexican bea.n beetle. The follow- 
ing were recommended as superior to magnesium arsenate: 
SPRAYS 
Derris (finely ground root), U-percent-rotenone content, 2 to 2.5 pounds 
to 50 gallons of water. 
Sprays to contain approximately 0.02 and 0.025 percent of rotenone respect- 
ively. 
