, 5S - 
the beetles fcr 3 c'.ays with soybean plants previ'^usly duster!, vrith miytures 
cf derris pov/der and talc. After using laleur plus tr.lc 1:1, the nuip.ber of 
"beetles that died on successive d?.ys were : : _: - '- \ ^: .■' 10,ll,7,.-.?.i'i-3- 2, re- 
spectively, of p, total of ^f- "beetles. One-hundred-percent mortality \^as 
still obtained, even by dusting v/ith laleur plus talc 1:5, l6 beetles died 
v.'ithin 3 c'.ays and the r the r 1^4 were r^aralyzed and died vrith 3 t'^ 6 days 
after being dusted. Of the untreo.ted beetles, and of th-^se dusted with 
talc (30 each), only 2 and 3, respectivrrly , died. 
As Flagiodera does not occur in the neighborhood of Buitenzorf:, 
Java, two plantings in the Kala-san district were c'xisted with a dust ni?:ture 
composed of laleur, Changi, and talc, which contained about 1 percent of 
rotenone. The dusting was done with a hand duster. The first experiment 
took place on July 12, 1935, at which ti^ie a plantin^^; -^f about 620 SQuare 
meters was dusted with 1 kg. of powder nixture. The .effect of the dusting 
was checked on Julj"- 15. Apparently all the larvae were dead; however, the 
dusting had had practically no effect en the beetles. The. second e-'rerinent 
was made on July "^0, At that time a planting of fully 3''"* souaro meters was 
dusted with about 2/3 kg. of the d.ust mixt-ore. This plot was attacked ".:y 
adults only. Neither on the^ second nor on the fifth of August could any 
reduction in the number of beetles he observed,- — Van der Yecht ( ^J-Cl ) in 1^36, 
All the larvae but none of the beetles were killed :}y wetting with a 
derris povvrder sus'oensi^n with rotenone content of 1:5, '^Cf;. — Van dor Vecht 
(UOl) in 1936. 
Fodagrica javana (Motsch,), a kapok flea b.^etlc 
The beetles (20 in nuiiber) when placed on kapok leaves that had been 
lightly dusted with Changi plus talc 1:3 and laleur plus talc 1:1 did not 
feed and, apparently oy contact with the powder, were more or lesp par-lj'-zed 
after a few hours. Half, of them were dead after 2k hours, and of the re- 
mainder a few continued to react to touch for U to 5 clays, but they did not 
recover.— Van dcr Vecht ( Upl ) in 1936, 
Fodontia af finis Grli)nd. 
The larvae -^f this s"^ecies living on "kednnd'^ng" in Jav?, were dusted 
in the laboratory with derris (laleur) plus talc, 1:1. Six '^f the 10 nearly 
full-grown larvae fell from the leaves after an h'^ur, while the other h 
moved only sluggishly. All the larvae were dead in 2^^- h'-'Urs. There was n-^ 
mortality on the controls. — Van dnr Vecht ( ^'-Ol ) in IO36. 
Fpyl liodos chrysocephala L, 
Roebuck ( 33^) in 1037 rer.orted that cab' ages in Derb^ sure, England, 
were severely infested by this species during 1^135-36, The cobbages attn.cked 
by larvae were ploughed in and dusts of derris and barium fluosilicate and 
sprpys of lead arsenate were employed against the adults, Th'-^ winter of IO36- 
37 vas unfavorable to the pest, so crops were n't attacked the follovring 
spring. 
