-51- 
Under greenhouse conditions on Long Island a Urge percentage 
of the larvae and adults survived 5 days* exposure to the presence 
of derris powder sprayed on foliage and little feeding took place* 
The insect was able to distinguish between sprayed and unsprayed 
foliage, Derris sprays were lethal when larvae and adults were 
directly hit in spraying. Otherwise their effectiveness, when ap- 
plied for purposes of ingestion, was dependent on their repellent 
properties* The results of field experiments conducted in 1936 to 
1941 on lima beans showed that dusts containing rot en one were more 
effective than those containing pyrethrum. The addition of rote- 
none to the dusts of oopper sulfate and lime improved foliage pro- 
tection, but had practically no effect on yield. In 1940 and 1941 
pyrethrum tended to give better yield than rotenone.— Huckett (297 , 
299 ). 
A study of the compatibility of cube combined with bordeaux 
mixture was conducted in Ohio. The colorimetric analyses and tests 
with goldfish indicated a 20 percent reduction in rotenone content 
of the mixture after 30 days, 40 percent after 62 days, and 50 per- 
cent after 92 days, but no further change was detected even after 
12 months. In the field, a bordeaux-cube combination, originally 
made up to contain 0,02 percent of rotenone, but which had deteriora- 
ted about 50 percent in rotenone content at the time of applica- 
tion, was tested against the bean beetle. It appeared equal in ef- 
fectiveness and residual effect to a cube spray containing 0,015 per- 
cent of rotenone,— Fulton and Nelson (207) . 
In New York a 0.75-percent rotenone dust, applied at the rate 
of 30 pounds per acre of beans, was the most effective of the in- 
secticides tested, and a spray containing rotenone and skimmilk 
powder was more effective than one of nicotine sulfate in suramer- 
oil emulsion. Significant increases in yield of field beans were 
obtained by dusting with Alorco cryolite, copper arsenate-lime 
(1:4), or with a 0,75 rotenone dust.— Schwardt and Ramsay (528 , 529 ) . 
In February 1942 the use of a 0.5-percent rotenone dust, ap- 
plied at the rate of 20 to 25 pounds per acre per application, was 
recommended.~U. S. Bureau of Entomology and Plant Quarantine ( 626 ) • 
Pyrethrum was suggested as a substitute for rotenone. Instruc- 
tions to victory gardeners stated that rotenone was restricted in 
1943 to use against the bean beetle and a few other insects .--J. S. 
Bureau of Entomology and Plant Quarantine (626 , 630 ) • 
A dust containing Cuprocide (G.A.) 6 percent, dusting sulfur 
30 percent, derris (5 percent of rotenone) 15 percent, and pyro- 
phyllite 49 percent, was effective on Long Island •--Cunningham (151) » 
