- g3 - 
'l!pila?hna vigintioctomac^:lata ab. niponica Lov. 
Takagi and Ito (363) in 19?2 r^oorted that dcrri? is v^ry effecti-^o 
against Epilachna niponica Lev. [E. vigintioctoaaculata a'b. ni-ponica Low., 
according to Muoseteck] . 
Epilachna viginticctopunctata (F.) 
A potato field near Sindanglaja, Java, attacked by both adults and 
larvao rf different instars, was dust-d v;ith lalf^ur plus talc 1:1 by 
means of a ^and dustor, at about 9 o'cloclj: on sunny mornings. After 
the dusting 20 adults and the same number of lan'^ae were gathered from 
this :plot and from a neighboring untreated plot. The dusted beetles 
showed signs of paralysis after r^bout 1 hour and s.-^cretrd an abnormal 
amount of liquid; after 2 hours nearly all were complotoly paralyzed 
and only a few still tried to stretch their vrinrs. After 2^ hours, 
12 were dead and the rest died the following day. Also, the larvae 
ceas'd frrding after the dusting; I7 were dead after 2^4 hours, ajid the 
other 3, which ^t that time still reacted to contact by moving their 
feet, died the following day. The untreated insects were observed for 
U dayr , and remained alive during tha.t time. — Van der Vecht ( ^01 ) in 
1936. 
Ycshi-da ( Ulg ) in lo^6 r^port-d that adults in Formosa are killed 
by pyrcthrun with soap '>? a pT:)ray or with a,sh as a dust, sprays of derris 
or nicotine being much Ics effecti-"-e, 
Epilachna sp. 
Extracts of seeds of Tephrosia car.dida and stem bark ef Mundul ea 
sericea were effective at 2- and 3-p^rcent conc^'iitrations , respectively, 
in 2k hours against the larvao. — Bhatta and l^arayanan (2^) in 193?. 
Water suspensions and aJchcholic extracts of Derris elliptica roots 
(rotenone nearly 7 percent) grown in Mysore, India, w-re .-.f foctive against 
Epilachna grubs. — Mysore, Ir.dia, Depart'vnt of Agricultur-^ (^^l.) ir. 193S. 
Hippodamia conv ergons Guer. , th" conver^-r^nt ladybcetle 
De Ong ( 100 ) in 193^, in testing the comparative insecticidal 
value of four species of derris from the Philippine Islands, used this 
8p' cies as one of tho test insects. 
Kau^r and Peterson (lo2) in 193?? trst'^d derris pcwdcr (5 pf^rcent of 
rotenone, lU percent rf etlier -^ytractivcs) at a concentration of 3 pounds 
por 100 gallons a^^inst th( convergent ladybeetle. T^.p. authors concludrd 
that of the insecticides tested, phenothiazine and derris proved to be the 
most toxic to all stages of this coccincllid. Phenothiazine killed 95 to 
100 percent of t>-'^ adult^, ''-.{iS, and larvar , and derris killpd approximately 
70 percent of the adults, U6 perc'nt of the larvae, and lU p<^rcent of thr 
eggs. The ogc-" mortality ro-ported with derris is much greater if the large 
numbrr of larvae that died a short time after they hatched are included 
vrith the numl't^r of dead eggs. 
