-154- 
Archips xylosteina (L. ) 
Yago ( 502) in 1933 wrote that ( Tortrix)(Cacoecia ) Archips xylosteana , 
which was formerly abundant in pear orchards in Shizuoka, Japan, had be- 
come scarce, probably owing to the use of- insecticides, including derris. 
Nakayana ( 288 ) in 1937 reported that this species was widely distrib- 
uted on apple and pear in Korea. Sprays containing nicotine sulfate or 
derris were effective against the young larvae and lead arsenate was effec* 
tive against the older ones. 
Argyrotaenia citrana (Fern.), the orange tortrix 
Basinger and Boyce (_24) in 1936 reported that cryolite 'and barium 
fluosilicate may be combined with derris compounds for citrus aphid con- 
trol. Organic compounds used alone were ineffective. The following re- 
sults rath a derris. containing 5 percent of rotenone were obtained at 
Corona, Calif., in 1934 against orange worms, principally the larvae of 
this species, though Holcocera iceryaeella (Riley) and Platynota stultana 
(Wlsm. ) were also involved. 
Material and concentration 
Fruits with live 
larvae under but- 
.tons prior to treat- 
ment 
Recently damaged 
fruits observed 
per hour approxi- 
mately 130 days 
after treatment 
Derris (rotenone 5 percent) 
1:800 
Derris (rotenone 5 percent) 
1:800 + synthetic cryolite 
3 lb./lOO gal. 
Check (no treatment) 
Percent 
31.2 
14.8 
30.3 
Number 
69 
116 
Argyrotaenia mariana (Fern. ),• the gray-banded leaf roller 
Kelsall and Stultz (£34) in 1937 reported laboratory tests of dorris 
(3.95 percent rotonono) and pyrcthrum (0.94 percent pyrcthr-i ns) as dusts. 
With gypsum as the diluent. Results with derris were as follows: 
Concentration 
of derris 
Percent 
5.0 
12.5 
25.0 
100.00 
Mortality 
Per 
Days 
20 
8 
10 

40 
5 
40 
5 
