Chamberlin and Madde.n ( 77 ) in l^V r^rortpd or. th^ v?>1up of rote- 
none dust'-- for thp control of fl?a ■br! = tl<='! attac^-<:ir.g ishade-erown tobacco* 
In th*^ G'por.eia an-". Florida producing re ion the crop i«» attacked 'cy the 
tobnccn fl'^a bpr-tlp ( S-oitrix •o-'^rTula ) while in the Connecticut Vr-Hej'- 
the potato flea "ber-tle (S. cuca-npria (Herr,)) is the attackin^T c^^cies. 
Because- of lovr^r coct, cube has b'- en used inst-^ad of der-^is. Th<= thrp*:* 
main advantaftvs of th--. rotenone-braring dust mixturf^-s -nade of cube povd^r 
ov^r the insecticides used pre-w'iousl" to control flee b^etle<! on ph?5de= 
^rovn ci£;s^r-wra'n"^er ti^bacco ar^- s^^e^d of action, saf^tv to the crop-, snd. ab- 
sence of ob.-^ectii^nable residu'^, conbined with a relnti-^ely high toricit" to 
thf^ ins'^ct. The outstanding disa'.'"'antrt:'=- of this natrrial is thet its effi- 
ciency is of shnrt dur^ti^n. und' r the conditions in'->os'=d in tobacco sh^'es, 
Cubc-dupt rr.ixture cont-^ining- 1 "oeroent of rotenona exert«^d a 7^-"^'"rcent 
kill '^f th:^ fie? b'^ptle B, ptr-^ila aft^r en exposure of 2^ h-^ur.c to sun- 
light, which wan ab.'^ut the eq-jlvpi-j^t of 2 deys of cl'^udlecc -ypos'j.r'^. 
The d^irst -nixturp cont-ininf 1.5 ^ofrc^nt of rof^none maintained its toxicity 
n^xch longrr than did th-^ 0.5-'"'TC-nt materiel. It ap'-'ears that the eff^ct- 
iv-ne--r. of cubp-d'^st Tii'^turos conteinint- 1 TPrcent of rotononp is United 
t<^ avout 7 de"p under firld conditio;-*-, , 
Until additional d^te ^t>- obtained it s<?!^ms desirable to cntinu'^- the 
pr-'s-nt reco 1 •!pr(-',r.ti'^ns of - dust -^.irture cntrinine 1 -o^rcent of rotenon* 
for the contr'il of fl^vo bo'^-tl'c or: shade-gr'^vm cigar-v'r^"^'0''-r tob'^cco, 
Rotcn^ne-dnct rfixtur'^" r,v,-p-r to -ill fle^ beetles ■orincioelly be- 
c'^uaf the irritating:- orop'-rtior! '^f this insecticide i'^p'^l th" beetles to 
"cleen up" after conin'^: in contact '^'ith it. Dosa^^es of this insecticide 
sh'^uld therefore b^^ r,uffici''=nt to Ti""o r;ood coverage of the plant*. For 
newly get tob^cc-^ nle'.ts a dona-?^ of U or 5 pounds p-r -"cre should be suf- 
ficient wherr-T in the "i^ture cr'^-'-' S t-^ 10 pounds rer ^cr'^ is belie^'^-d to 
be necessary. , Saticfoctor" dilu'-its ore fino-ly ^iround G-i^oraiia cley, kaolin, 
diatornaceoup earth, and tobacco du<«t» 
Sh^nd.n r-t ^1.(3^6) in I937 re^ort-d th^t en off-cti-^^ nort^lit- -^f 
tobacco flrr b'^-'tl'^"' cm op '^bt-i-ed by the -prop, r applic^ti'^n nf =. duit 
c^nt^inin.r 1 -oercr-nt r^f rot-non'^ ^t eny ti'^e of the d^y vrhen t'le wind vf^locity 
doe« n-^t '-•vce'-d ^rrrovi-'- t«ly U nile" r^.^r hour, 
T-o S^nth Carolina A^,ricultrjr^l Ex^erinent St-oti'^n (jU^) in 1937 
''t«~t'^d that a cub^ dnat cont-'^in^ n-- 1 -'orcentof r'^tenon*' vras more pff'-'ctl'^e 
th;n -. one cont"inin,:v 0.5 •■ercnt of roter/^n'-- or e dust contoining 36 rercnt 
of cryclit'- ^'hon ^T>niif^-''. rt th^ sn ^n r^t" •o.^r acre. For th*^ be<at results 
with l-;-'^rc'"nt-rot'-n'^no -^r.st, th- r-'t'^ ^f -'^T-rii^^ti^'n should r?>n>;>~ from nenr 
c pound"' r' r ecr'~ w'-o- th'=> vd^'-'t'' ere «»mrll t^ 10 r.ounds or m'^re for mst".re 
plant's. ,-dth-Tv,h ir^r-ct irj^i.r-- wor- Tft-r to pl^-nta tr'-^-tf^d only nt brood 
oTr •'-r.c'" then vrh'-r'^ nrr»- froonent ^r;^lic' ti^^R wre nn-io^ co-^ ^^rci^l control 
w^ <5 o'''t^i"ed o^ both srri""^. W'^..-- 'lore- det<"iled informetion is o-^nil^^bli^- on 
t-.e h^bit'> fnd life hi^tor- -f th-- tobacco fle=t b-^rtlo, apT>lic-tions of Insr-ct- 
icido" c--^ O"^ ti'-e'-'. T-rf ^ -cnr'^t'"l^' with ro -rrd t'" br-^-^d "t r.-::enc'^, with 
rrobr.cl'- incre-or in the efficiency of the insecticides. 
