- U1+ - 
lTpttlr-!3 ( 29U ) in -1939 :rPcon'i.er-dpd d^-rri<5 d-.st for tlir- control of the 
trtncc^ flpp. 'bf'^tlp on p.5:^plant p.nd catl)?..--:- in S'^uth Ca.rolinn, 
The Pf-nnsyi-onip Agricultural Experiment Station ( ^15 ) in 19^9 re- 
sorted that flea oc^tle in.j-'^ry to totacco and pota.to'^'^ is caused ty the 
too?,cco flea h-etlp a.ftf^r nid-July, -The sreatest -protection against 
"be-etlf da.nap^e to totacco leavr-s vp.s a-fforded ty dusting with a fixture of 
1 pa.rt of ero^ind c'lDe root (U -oercent of rotenone) and 3 part?? of st^rilizod 
tolDacco d.ust (filter dust ri^-aainine after nicotine extraction) with 1 T)art 
to GOO of a v'-tting a,crnt. T" a naterial wa<= appli<^d at the rat^ of 3 to 5 
pou-id?! rrr acT'^ t^ newl" set plant?, increased to 10 to 15 ro^indn -p-er acre 
after top->in.-. 
"Oal^rucella ruloi TananuVi " 
Ta/n^.nulci ( 36U ) in 192o reco a-aended derrip and soap spray for the 
.control of this insect ^n f-'^ y^ung leaves of strawb'^rry nl^'nts in sout^^^rn 
Sakhalin. , ' ~ ' ' 
Q<--.lerucella •'"i'burni (Payk<) 
Sensitive to derris dust, — DeBussy .-t al, (61) in 19^6, 
G-alerucell? yant'-omplaeno (Schr,), the eln leaf "beetle 
Ha'-nilton nnd G-'-ranell ( 17U ) in 19"^'-^ ^PT^ortp•d that Aerris powdor 
TT'plir-d ^s a sDra'- gave good control, and the foliarC' retained consi'derahl'^ 
tori city for 6 days, 
Hanilt'-n ( 163 ) in 1935 revi'='wod infornati^n on non-polaonoua sub- 
stitutes for !^rse-".icals, Povrd'^red derris is more stahlo and thep.vpr than 
derris extract, Ri^fprencp vras made to Hanilton and G-f-nnpll ( ij^ ) who, in 
19!^^, rerrort^'d that a dust c^ntainin;? 1 -rerc'-nt of rotenone, dTTut^d 1 
pound to t; gall'^ns of vatr-r, gave almost 100-percent Cf-^ntrol of the elm 
Icof tr-rtl'^-, !^.nd 3 day^ after ha^in;:; Dpon gpr^^ypd 96 p'^reent of the larvae 
placod up^n the sprayed f f-^lia^."^ wore killed, and 6 d^ys aft'^-r sT)rayins 5S 
percent were dead, 
Rotenone dust .-^'vp evc-ll^--nt cntrol, — Van G-undia ( ^4^ )in I936, 
Ha-iilton (IJS) in 193? r'^ported that -^In leaf "b-etl^s on ^In tr^.-s 
wer*" n'^t satisfactorily controlled by r\ srra.y of U -pounds of derris or cube 
povrdrr (U T.'erc^nt of rotenone) and U porinds of rosin-residup enulsion ■o'^r 
100 ■::-'^llonp of watT. Fi-'-'e teste werp '.:a'>, two r,f which wer^ satisfactor-^'. 
T-.r- ppr-'^ ■ acts ns a contact r^oison and as a. r»^rellent. The prriod of effect 
i-"TnesF is 5 to 7 days. Control see is to dooenfl on tl ■'e of aT^r<li cation, 
T r llew Jorsoy State A^rric'^ltur-ol Exoeri ornt Station (.29S_) in 193r 
re-oortcd that ^ sora^' of derris or cub-^ ^-ovrd'-r plus rosin-residue emulsion 
in vrat'T vras ~ff ecti'"''f^ ni-ra.inst the lar-^J-^o of the elm l^af bortle and has pom 
c-ntact and rr-npHr-nt action against the adiilts. 
