-32- 
proved very effective against ( Plane ) Dasychira mendosa (Ebn.) infes- 
ting tea plants in 'Formosa. 
Euproctis conspersa (Felder) 
The Institute of Physical and Chemical Research (214), Tokyo, 
Japan, in 1927 reported that Neoton at 300 gm. plus 750 gm. of soap 
per 4-0 imperial gallons of water gave IPO-percent mortality of the 
larvae. 
Euproctis fraterna (Moore) 
Bhatta and Narayanan (31) in 1938 reported that in small-scale 
field trials extracts of seeds' of Tephrosi a Candida and stem bark of 
Mundulea sericea were effective at 2-and 3-percent concentrations, re- 
spectively, against larvae of this species on apple. 
Water .suspensions and alcoholic extract? of the roots of Derris 
elliptica grown at Bangalore, India (rotenone 7 pe_ v cent, etl er extra<j 
tives ,22 percent) were effective. — Mysore, India, Department of 
Agriculture (287) in 1938. 
Euproctis pseudoconspersa (Strand) 
< ■ 
Sonan (378) in 1927 reported that spraying with derris and soap 
. proved very effective against this species infesting tea plants in 
Formosa. 
Hemerocampa leucostigma( A. & S.) the white-marked tussock moth 
Mclndoo, Sievers, and Abbott ( 264. ) in 1919 reported the results 
of tests in which fine derris pbwder was extracted successively with 
five solvents, namely, petroleum ether, ether, chloroform, alcohol, 
and.water, in five .different sequences. Water used as the primary 
solvent extracted 10.80 percent of the material. The extracts and 
the marcs .were, added to honey and fed to honeybees ( Apis mellifera L.), 
The extracts were dissolved in alcohol (0,4. gm, in 10 cc. of 95 
percent alcohol), and 1/4. cc. of -this solution was mixed with 5 cc. 
of honey. The water extract had no effect on the bees tested and the 
powder exhausted with water killed 94 percent of the bees within 48 
hours. All the other extracts, whether obtained with the use of heat 
or without it, wer-, almost- equally toxic to honeybees. Using the 
same extracts against tussock moth caterpillars gnve similar results. 
Hamilton (.180) in 1938 reported that larvae on various shade 
trees were not satisfactorily controlled by cube or derris-pbwder 
spray (4. lb. of powder containing 4 percent rotenone per 100 gal, of 
water, plus 4 lb, rosin-residue emulsion) . The spray acts as a cont- 
act poison and as a repellent. Control was 10 percent in one test 
and from 50 to 75 percent in other tests. 
La ilia suffosa (Walk*) 
Gater and Yusope ( 155 ) in 1925 stated that the usual aqueous der- 
ris extract, as made in British Malaya, would form an effective spray 
