-39- 
Van der Laan { 213 ) in 1935 reported that when used as a spray 
containing 0.1 to 0.5 percent of Agr.il, at a concentration of 1:5,000, 
rotenone gave a mortality of 95 percent and dihydrcrotenone a mortality 
of 80 percent of the larvae. 
DeBussy et al. (57') in 1936 reported that this species is sensi- 
tive to derris dust. 
The Koloniaal Instituut ( 24.0 ) in 1936 reported that powdered 
Tephrosia root applied as an undiluted dust was inert to the larvae. 
Derris-kieselruhr dust (1:4.) was always deadly. 
Phalera flaycscens (Brim. & Grey) 
The Institute of Physical and Chemica" Research (214), Tokyo, 
Japan, in 1927 reported that Neoton at a concentration of 150 to 225 
gm. plus 750 gm. of soap per 40 imperial gallons of water gave 100- 
percent mortality. 
Datana ministra (Drury), the yelloar-necked caterpillar 
Mclndoo, Sievers, and Abbott (264) in 1919 reported that two apple 
trees, on which large colonies of nearly full-grown larvae were feed- 
ing, were sprayed with derris at the rate of 1 pound of powder to 50 
gallons of water. Twenty-four hours later one living larva was found 
on one tree and two on the other. The ground under the trees was 
thickly sprinkled with dead larvae and many had lodged in the trees. 
Kopp (242) in 1924, in a review of the use of derris as an insec- 
ticide stated that derris powder has riven excellent results against 
this species at a concentration of 500 gm. to 200 liters of water. 
Observations on this species indicate that the powdered root of 
Tephrosia virginiana has little or no volue as a stomach poison but 
is repelling and has promise as a contact insecticide. Field exper- 
iments with this powder at 4 pounds per 100 gallons are described 
against this species feeding on post oak. Excellent control was 
obtained.— Little ( 254 , 255 ) in 1931. 
The Iowa Agricultural Experiment Station ( 215 ) in 1934 reported 
that C. H. Richardson found dihydrcrotenone approxi - ately one-half 
as toxic as lead arsenate to the larvae when tested by the leaf— sand- 
wich method. 
Hansberry and Richardson (183) in 1936 reported the median lethal 
dose of dihydrorotenone fr-r Da tun minis^.r a larvae to be 0.11 rag. per 
gram jf body weight. 
Nympha] id 
Euphydryas chile 'ona (Dbldy. and Hew.) 
DeOng and White ( 96 ) in 1924 rep >rted that derris poi ve 
98-percent control of the lam ' s upon whJ ch 
* i 7 '-ere feeding. 
