-21- 
Concentration 
* 
* 
Trial 
No 
. 
"T "■ 
(mg./l: fflgJ of 
derris) t 1 
; .2 
i 
1 
3 
! 4 
• 
Average 
250.0 
•loo 
70, 
100' 
7.0 
65.0 
125,0 
: 100 
60' ' 
80 
: 50 
72.5 
62.5 
90 
40 
. ...... ~~*- >■•' 
60 
_40_ 
57.25 
This pest on cherry, pear, and plum was killed by a product contain- 
ing 12 percent of powdered Lonchocarpus nicou root (6 percent rotenone 
content) and 88 percent of talcum, according to a .letter from Etablisse- 
ments Rotenia to R. -C. Roark in 1938. 
Cingilia cat en aria (Drury) , the chain-spotted geometer 
Derris:, both dust and spray, was ineffective. -- Kelsall et al. ( 233 ) 
in 1926. 
Paleacrita vernata (Peck), the spring cankerworm 
McDaniel ( 260 ) in 1938 reported on control on elms in Michigan. 
All sprays v/ere applied under 600 to 800 pounds pressure at the nozzle 
and none injured the foliage. Vo live larvae v/ere found at the end of 
72 hours after the application of cube or derris powder. (3 and 4 pounds, 
respectively, plus 3 pounds of rosin residue per 100 gallons of spray) . 
Larvae were numerous on the unsprayed trees. 
Selenia tetralunsria (Hufn.) 
Gimingham and Tattersfield ( 161 ) in 1928 found that extracts of. 
Tephrosia vopelii leaves r»nd the stems and roots of black and white 
haiari were extremely repellent to larvae, ^ven at high dilutions .( 1 
part of plf>nt material to 400 parts of water) the sprayed foliage re- 
mained uneaten, and tho larvae died of starvation. Soap, 0.25 percent, 
was a,dded to all these extracts. 
Tattersfield and Gimingham ( 401 ) in 1932 reported that an alcoholic 
extract of the root of Tephrosia macropoda when sprayed on the larvae 
had considerable value as a contact insecticide. The stems v/ere less 
effective and the leaves wero of little value. Alcoholic extracts of 
black haiari ( Lonchocarpus sp.) were toxic to the young larvae and to 
those three-quarters grown. 
Tephroclyntia absinthiaeta (CI.) 
Schotte and Gornitz (364) in United States patent 2,024,392 claim 
an insecticidal preparation consisting of a mixture containing 
rotenone and veratrine. They also claim an insecticidal preparation 
consisting of a mixture containing 2,5 parts of Dorr is elliptica 
root and 7.5 parts of sabadilla seed. By combining one of these 
drugs containing rotenone with a drug containing veratrine, 
^37^53 ( -'ll^ sabadilla seed or an extract or alkaloids recovered from 
