- 121 - 
Tho Hdult- i^ not susc^'otible tc •l-rri'^. — Craufurd-B-n'^on (20) in 1Q78. 
TrilJoliu" confusun ^u"-. , th-^ ccnfu<5od flour t-'-^tlp 
Billing?, pcccrdine to Ca-rob-'^ll (66) in 1*^32, tost^d th" action of 
rctpnour upon th-^ ccnfup' d flour b-'^-'^tlr^, "but thf r"sult?; ^v not rpcorded. 
The larva is not ^^uscpptibl'-^ to dprris. — Craufurd-Bt^n'^cn (^O) in 193S. 
TonclDrionidne (unid^ntif i^d pp.) 
A tf^nebrionid fr-rdc on dnrri'^ root^ in ptorag". — G-ator ( l62 ) in 1925. 
Colropterca .unidrntif iod sp.j 
For ""brown beotl'^," sp'^ Kcarns ( 236 ) undrr Phyllodecta sto. , on p^g.-Ts 55 
and 121. 
D?.nirl5 (25./' i" 1905 st^t'^l that son.- colcopt'-rovis larvae ^rf- onlv 
temporarily injured by d-^rri^. 
Flippanco ( 1U5 ) in I92O =;uggac;t'-d d.-^rris r^ovi^r for ccab-^ting '^ariou?' 
snail bortle'5 attacking pains in thr- S^.r^it'^ S" ttl'nr-nts. 
Grist (167) of thr Fed^r-'tad i>ialqy St-'t' <= Dp>iartnrit of Agricult^orp, 
in 1^26 wrot- that tuba root ho. b' '-n f^und to contain borer^, which not 
only eat thr root but al^o d'?stroy it?? toric qU'-^liti.^?:. 
Ncoton, 1 p',-and in 20 L-nporial gallons of wat*r plus 2 pounds oif soap, 
killed 100 prrcnt of thr- larvae of tlir strawberry beetle and was effective 
against both adults and Irrvr^'^ of leafb-- -ties. — Institute of Physical and 
Chenic-1 Research ( 220 ) in 1927. 
Bock (^) in 193^ wrot>-- that an alcoholic extract of derris plus 
9oap had pjTovGd equal to »n arsenical niyture when sprayed oti beetle's. 
Leaf beetles can be destroyed by derris. — Koloniaal Instituut of 
Amsterden (12, 1^) in I936 
Cpl'lwell (_65) in 19^7 re--ort'^d on thf control of the rf^d-shouldprec* 
leqf b'-'-tle in Q,ue^-nsl^nd, Dusts containing either or bothr pyrethrun and 
derris as toxic ingredients were used on citrus trees carrying e fpirly 
hea'^y infestation of beetles. The results with pyrethrun were particularly 
satisfactory. There was an alnost ccnplete drop of senipnrr>lyzed b.eetl'^s 
within a few ninutes, and obsrrvations sut^gested that cnly a very small 
proportion of these recovered suf ficif^ntly to fly or to climb the trvmks 
of the trees. Growers are, th'-refor'^- reconnended to combat this pest by the 
use of a pyrethrum dust. If pure pyrt^thrum i" purchased, it ctn^be mixed 
with eqiial parts of weight of kaolin (a cheap fill-r) to reduce the cost 
of thi- treatment. As derris is <'omewhat slower in action and 'considerably 
less effective against this pes than pj'rethrum, dusts cont-'^ining the form^^r 
insecticide alone cannot as yet be recommended for the control of the ree'.- 
shouldcred lcr<f beetle. 
