- g2 
wero attributed principally to the superior eff ectivpr.rss of this material 
against the corn earworm, since previous erpcriment? have demonstrated 
th^t derris and cubi- are of little value against this pest. 
Good control of the Mexican "bean beetle can be obtained by using 
a dust containing from 0,5' to 0,75 percent of rotcnonc. Good results 
can also be obtained by spraying vrith U pounds of finely groxmd rotenonc- 
bearirig powder (k percent of rotenone) in 100 gallons of water to vrhich 
has been added about 2 pounds of skim-milk powder. — Crosby, Chupp, and 
Leiby (^2) in I939. ' " ■ 
in 1939 
C. B. Dibble in a "Bug Flash" [post card] /advised Michigan farmers 
to apply derris or, pyrethrura sprays or dusts to control the Mexican bean 
beetle. Some preference seerns to be shown at present for derris dust, 
and thip material should contain from 0.55 to 0,75 percent of rotenone 
and should be applied at the rate of 25 to Uo pounds per acre of snap 
beans. To gi^-e effective results, the material must be blown under the 
plants and bo^mded back onto the under sides of the loaves. One treat- 
ment may be sufficient, if timed exactly right, but ordinarily two treat- 
ments are reouired for a season's protection. 
A mixture of I5 parts of ground rotenone-bearing root (5 percent of 
rotenone), 15 parts of lithopone-zinc s^ilfide pigment, and 70 parts of 
kaolin or other inert carrier vras toxic to bean beetles for a longer time 
(85 percent longer on bean plants) than ordinary rotenone dust. During 
thei^e tests there was a normal rainfall. — Faloon ( II7 ) in 1939* 
M. P, Jones ( 233 ) in 1939 rocom'-^-'ended derris or cube. for the control 
of the Mexican bean beetle. 
Kettles (29^-!;) in I93Q recom-iended derris dust (0.75 percent- of 
rotenone) or spray (3 pounds cube or derris of U percent rotenone content 
per 100 gallons of v;ater) for the control of the Mexican bean beetle in 
South Carolina. 
The New York State Agricultural Experiment Station (_303)in I939 
reported 'that rotenone dusts and sprays a.pparently are effective and 
pr?ictice.ble for control of the Mexican bean beetle in the field, 
Sherman and Todd ( 33^ ) in 1939 recommended rotenone dusts (0,5 or 
preferably 0.75 percent of rotenone) or sjjrays for the control of the 
Mc:irican bean beetle in South. Carolina. Tests are recorded with the pro- 
prietary rotenone products Cubor dust, Cubor spray, Kubatox, Red Arrow, 
and Fysol, and with dusts made by mixing cube or derris with talc, tobacco 
dust, kaolin, sulfur, hydratcd lime, and talc plus lampblack. 
The United States Bureau of Entomology and Plant G^uarantine ( ^99) 
in 1939 aiioted the County Ag-nt of Crawford County, Ind. , as reporting 
that roteno: e [derrisj-sulfur dust on the Mexican bean beetle gave 100 
percent kill in every case. \ 
